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Graeme Luke (McMaster University)2025-07-20, 9:30 a.m.
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Roberto De Renzi (Department of Physics and Earth Sciences, University of Parma, IT-43124 Parma, Italy)2025-07-20, 10:15 a.m.
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Ifeanyi John Onuorah (University of Parma, Italy)2025-07-20, 10:45 a.m.
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Ifeanyi John Onuorah (University of Parma, Italy), Pietro Bonfà (Dipartimento di Scienze Fisiche, Informatiche e Matematiche, University of Modena and Reggio Emilia, IT-41125 Modena, Italy)2025-07-20, 11:30 a.m.
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Jincheng Huang (Memorial University of Newfoundland)2025-07-20, 1:30 p.m.
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Philip Jones (philip.d.jones@warwick.ac.uk)2025-07-20, 1:45 p.m.
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Soshi Ishitani (Osaka University)2025-07-20, 2:00 p.m.
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Mikhail Yakovlev2025-07-20, 2:15 p.m.
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Theo Breeze (Durham University)2025-07-20, 2:45 p.m.
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Katie Curvelo2025-07-20, 3:00 p.m.
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Miyahara Hiroaki (Muroran Institute of Technology)2025-07-20, 3:15 p.m.
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Edward Thoeng (TRIUMF)2025-07-20, 3:30 p.m.
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Benjamin Orton (STFC)2025-07-20, 4:00 p.m.
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Nathan Bentley (University of Durham)2025-07-20, 4:15 p.m.
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Jeff Sonier (Simon Fraser University)2025-07-21, 9:00 a.m.
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Stephen Blundell (University of Oxford)2025-07-21, 9:20 a.m.
Many magnetically frustrated systems exhibit what is known as persistent spin dynamics (PSD) in $\mu$SR experiments, the origin of which has remained mysterious since their discovery in the 1990s. As the temperature is lowered, the muon-spin relaxation rate rises (as would be expected for the slowing-down of spin fluctuations) but this rate then saturates at low temperature, the...
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Tom Lancaster (Durham University)2025-07-21, 9:40 a.m.
An important theme in magnetism is the understanding of phenomena in reduced dimensions using topology. Examples include excitations such as walls, vortices, merons and skyrmions, which exist in the spin textures of a range of systems [1]. Here we discuss case studies from our recent work, emphasising the ways in which muon site calculations, material simulation and $\mu$SR data can be...
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Ifeanyi John Onuorah (Dipartimento di Scienze Matematiche Fisiche e Informatiche Universitá di Parma Parco delle Scienze 7A, Parma I-43124, Italy)2025-07-21, 10:00 a.m.
Intrinsic magnetic topological insulators from the MnBi₂Te₄·(Bi₂Te₃)ₙ family have garnered significant attention as versatile platforms capable of hosting a range of exotic quantum states and phenomena, including higher-order topological phases, axion electrodynamics, and the quantum anomalous Hall effect. This tunability arises from manganese–pnictogen intermixing, which is sensitive to...
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Francis Pratt (ISIS)2025-07-21, 10:40 a.m.
The metal-organic-framework compound Cu$_3$(HOTP)$_2$ is a small-gap semiconductor containing a kagome lattice of antiferromagnetically coupled $S$=1/2 Cu$^\mathrm{II}$ spins with intra-layer nearest-neighbour exchange coupling $J \sim $ 2 K. The intra-layer $J$ value obtained from calculations using density functional theory is shown to match with the experimental value for reasonable values...
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Dr Xiyang Li (IOP, CAS / QMI, UBC)2025-07-21, 11:00 a.m.
Electronic correlations lead to heavy quasiparticles in three-dimensional metals, and their collapse can destabilize magnetic moments. It is an open question whether there is an analogous instability in one-dimensional systems, unanswered due to the lack of metallic spin chains. Recently, using neutron scattering, we reported a metallic correlated frustrated spin-1/2 chain compound, Ti4MnBi2...
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Grace Morgan (University College Dublin)2025-07-21, 11:20 a.m.
Spin crossover (SCO) compounds are metal-ligand complexes which can easily switch their internal arrangement of electrons in d-orbitals from paired (low-spin) to unpaired (high-spin), by a minor variation in temperature, pressure, magnetic or electric field, or via irradiation. SCO is observed for some metal-organics containing Fe(II), Fe(III), Mn(III) or Co(II) ions, and the switching is...
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Jonas A. Krieger (Paul Scherrer Institute)2025-07-21, 11:40 a.m.
Altermagnets are a novel type of magnetic system that has a spin-polarized electric band structure in the absence of a net magnetic moment. Microscopically this arises from two opposite spin sublattices that are connected by a lattice rotational symmetry instead of a simple translation or inversion [1]. A ferromagnetic-like transport response makes these systems particularly interesting for...
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Martin Mansson (KTH Royal Institute of Technology)2025-07-21, 1:10 p.m.
Establishing a sustainable society is one of the 21st century’s grand challenges. A key barrier is the efficient harvesting, storage, and use of clean energy. Addressing this requires developing new generations of functional materials and devices with advanced energy and quantum properties, which in turn demands control over matter at the nanometer, atomic, and subatomic scales.
In this...
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Izumi Umegaki (KEK (High Energy Accelerator Research Organization))2025-07-21, 1:30 p.m.
Sodium ion batteries have been attractive and developed eagerly for practical use as one of post Lithium ion batteries. Battery materials NaCrO$_{2}$ and LiCrO$_2$ share an identical crystal structure: i.e., a two dimensional layered rock-salt type structure. NaCrO$_2$ shows high performance with a large capacity of 200 mAh in charge/discharge cycles, while LiCrO$_2$ has a small capacity in a...
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Kazuki Ohishi (Comprehensive Research Organization for Science and Society (CROSS))2025-07-21, 1:50 p.m.
To address carbon dioxide emissions, battery performance must be improved. Lithium-ion batteries (LIBs) dominate the market, but their limited and geographically concentrated resources have prompted research into sodium-ion batteries (NIB) to replace LIBs [1]. At J-PARC, we employed positive muon spin relaxation ($\mu^+$SR) [2] and small-angle neutron scattering (SANS) [3] in hard carbon,...
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Prof. Akihiro Koda (KEK/J-PARC)2025-07-21, 2:10 p.m.
Palladium metal is known to be formed as palladium hydride PdH x by the penetration of dissociated hydrogen atoms into the crystal lattice in a hydrogen gas atmosphere, and has been studied extensively from the viewpoint of industrial applications as a hydrogen storage material. On the other hand, it is also known to exhibit superconductivity at high hydrogen concentrations at low...
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2025-07-21, 2:50 p.m.
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Ryosuke Kadono (KEK)2025-07-21, 3:20 p.m.
The dynamical Kubo-Toyabe (DKT) relaxation function predicts the time evolution of muon spin polarization under zero and low longitudinal magnetic fields, which is determined by the linewidth $\Delta$ due to the static distribution of the internal magnetic field ${\bf H}(t)$ and its fluctuation frequency $\nu$. One of its important features is that it can clearly distinguish two causes of...
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Soshi Takeshita (KEK IMSS Muon)2025-07-21, 3:40 p.m.
The D-line of the J-PARC MLF MUSE has a pion decay section, which provides access to decay muons in addition to surface muons. The y-superconducting solenoid magnets used in the pion decay section have a large aperture and warm bore, allowing them to guide a wide range of positive and negative muons from high to very low momentum. In addition, the world's highest proton energy of 3 GeV makes...
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2025-07-21, 4:00 p.m.Oral invited talk. This category is for invited speakers only.
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2025-07-21, 7:30 p.m.
Bill Montevecchi is a Professor Emeritus and John Lewis Paton Distinguished University Professor [Psychology, Biology, Ocean Sciences] at Memorial University of Newfoundland and Labrador. Working closely with fishermen, he and his students study birds as indicators of environmental change. Conservation is a priority with research projects aimed at bird interactions with marine and terrestrial...
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Thomas Prokscha (Paul Scherrer Institute)2025-07-22, 8:40 a.m.
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Dr Sydney Kreitzman (TRIUMF)2025-07-22, 9:00 a.m.
The current and foreseeable status of the TRIUMF Centre for Molecular and Materials Science experimental facilities will be presented. The new M9A and M9H beam lines will be highlighted ... which provide a high flux surface beam and an arbitrarily spin polarized decay beam respectively.
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Dr Akihiro Koda (J-PARC MUSE)2025-07-22, 9:20 a.m.
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Adrian Hillier (ISIS Neutron and Muon Facility)2025-07-22, 9:40 a.m.
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Dai Tomono (Osaka University)2025-07-22, 10:00 a.m.
The MuSIC muon beamline at RCNP, University of Osaka provides a continuous muon beam with the K140 and K400 cyclotron accelerators. The employment of large capture solenoid magnets and a long cylindrical production target facilitates the utilization of high-intensity muon beams. The first muon beam was observed in 2012, and then user experiments were conducted between 2016 and 2019. However,...
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Lei Shu (Fudan University)2025-07-22, 10:40 a.m.
A Muon station for sciEnce, technoLOgy and inDustrY (MELODY) project has started construction in the beginning of 2024 at China Spallation Neutron Source (CSNS). A stand-alone target station is designed to produce pions and muons.Three muon beamlines are designed for various applications, including a surface muon beam, a dedicated negative muon beam and one decay muon beamline. A muSR...
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Sohtaro Kanda (KEK)2025-07-22, 11:00 a.m.
At the U-line in J-PARC MLF MUSE, ultra-slow muons (USM) are generated by laser ionization of thermal muonium (Mu) in vacuum. Mu drifts in vacuum with a Maxwellian velocity distribution reflecting the production target temperature; consequently, the USM obtained from Mu ionization are also possess correspondingly low energies. At the U-line, a high-temperature tungsten target (2000 K,...
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Prof. Yukinori Nagatani (KEK IMSS)2025-07-22, 11:20 a.m.
Muon microscopes [1-3] under development at J-PARC are reported. The transmission muon microscope (TμM) is an analog of a transmission electron microscope (TEM). By employing the strongest penetration power of muons into materials, the TμM allows us to visualizes the 3-dimensional distribution of electromagnetic field in objects much thicker compare to TEMs. This capability is useful to...
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Pascal Isenring (Paul Scherrer Institute)2025-07-22, 11:40 a.m.
Muon Spin Relaxation measurements at continuous sources have stagnated at a stopped muons rate of 40 kHz and generally require sample sizes of at least 5 mm by 5 mm. Taking advantage of recent developments in pixel detector technology, we successfully implemented a prototype Si-pixel-based muon spin spectrometer at PSI. Unlike scintillator-based systems, this spectrometer utilizes the MuPix11...
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Andreas Kreisel (Niels Bohr Institute, University of Copenhagen)2025-07-22, 1:10 p.m.SuperconductivityOral invited talk. This category is for invited speakers only.
Unconventional superconductivity is often referred to as originating from a pairing mechanism different from electron-phonon interactions and connected to an anisotropic superconducting order parameter with sign change of the Cooper pair wavefunction. A common microscopic mechanism discussed in view of high temperature superconductors is the spin-fluctuation mediated pairing where the...
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Adrian Hillier (ISIS Neutron and Muon Facility)2025-07-22, 1:40 p.m.
Unconventional superconductors offer pathways to novel technologies and deeper insights into electron correlations in condensed matter. Noncentrosymmetric superconductors, lacking inversion symmetry, exhibit mixed spin singlet/triplet pairing, making them candidates for time-reversal symmetry (TRS) breaking in their superconducting states.
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We have identified HfRhGe, a new noncentrosymmetric... -
Hans-Henning Klauss (TU Dresden, Germany)2025-07-22, 2:00 p.m.
After three decades of research, the symmetry of the superconducting state in Sr2RuO4 is still under strong debate (1). The long time favoured spin-triplet px + i py state is ruled out by NMR experiments (2). However, in general time-reversal-symmetry breaking (TRSB) superconductivity indicates complex two-component order parameters. Probing Sr2RuO4 under uniaxial pressure offers the...
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Petr Král (PSI Center for Neutron and Muon Sciences)2025-07-22, 2:20 p.m.
We report the discovery of a remarkably rich phase diagram in the kagome superconductor YRu$_{3}$Si$_{2}$, uncovered through a unique combination of muon spin rotation, magnetotransport, X-ray diffraction, and density functional theory calculations. Our study reveals the emergence of a charge-ordered state with a propagation vector of (1/2, 0, 0), setting a record onset temperature of 800 K...
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Motonobu Tampo (KEK)2025-07-22, 3:00 p.m.
Bronze, an alloy mainly composed of copper with additions of tin and lead, has been used for creating historical cultural artifacts across the world. Analysis of the composition of these artifacts provides important insights into their manufacturing techniques, trade routes, and cultural backgrounds. However, surface degradation due to aging—such as oxidation, copper carbonate formation, and...
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Michael Heiss (Paul Scherrer Institut)2025-07-22, 3:20 p.m.
Muon-Induced X-ray Emission (MIXE) is a non-destructive analytical technique that combines the unique properties of negative muons with high resolution gamma detectors to perform depth-resolved elemental analysis. At PSI, the Germanium Array for Non-destructive Testing (GIANT) instrument leverages a high-intensity continuous muon beam (15–60 MeV/c) to implant muons at tunable depths (µm to cm...
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Dr Michi Hirata (Los Alamos National Laboratory)2025-07-23, 8:50 a.m.Oral invited talk. This category is for invited speakers only.
In condensed matter physics, designing and understanding quantum materials has been the key to searching for emergent behavior and phases of matter and opening a pathway to use them for energy relevant technologies [1]. In the context of correlated quantum materials often hosting 4f and 5f electrons [2,3], a variety of intriguing physical phenomena appear and attract great attention due to an...
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Hank Wu (University of Oxford)2025-07-23, 9:20 a.m.
A quantum spin liquid (QSL) is a long-sought magnetic state in which strong quantum fluctuations prevent magnetic ordering, allowing spin dynamics to persist at very low temperatures. Rare-earth triangular lattice compounds have proven to be a particularly promising platform to study spin liquid behaviours due to their localised f-orbitals and inherent geometric frustration. We present $\mu$SR...
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Thomas Hicken (PSI Center for Neutron and Muon Sciences CNM, 5232 Villigen PSI, Switzerland)2025-07-23, 9:40 a.m.
Recently, bulk superconductivity has been observed in the layered nickelates La₃Ni₂O₇ and La₄Ni₃O₁₀ under hydrostatic pressure, with transition temperatures of up to 80 K. At ambient pressure, these compounds exhibit intertwined and non-trivial spin-density wave (SDW) and charge-density wave (CDW) orders.
In this work, we present a detailed investigation [1, 2] of the structural,...
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Dr Shams Sohel Islam (PSI Center for Neutron and Muon Sciences, Switzerland)2025-07-23, 10:00 a.m.
The cuprate superconductor La2-xBaxCuO4 (x=0.125) is a striking example of intertwined electronic orders, where 3D superconductivity is anomalously suppressed, allowing spin and charge stripe order to develop, in a manner consistent with the emergence of a pair-density-wave state.
Understanding this interplay remains a key challenge, highlighting the necessity of external tuning for deeper...
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Hisakazu Matsuki (Kyoto University)2025-07-23, 10:40 a.m.
Muon Knight shift measurements are a well-established method for determining pairing symmetries in superconductors, particularly effective for $f$-electron-based heavy fermion superconductors. However, precise measurements remain challenging in $d$-electron-based superconductors such as Sr$_2$RuO$_4$, where the Knight shift is intrinsically an order of magnitude smaller.
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In this talk, we... -
Toni Shiroka (Paul Scherrer Institut & ETH Zurich, Switzerland)2025-07-23, 11:00 a.m.
Superconductors that spontaneously break rotational symmetry in their electronic ground state are called nematic superconductors. Cu$_x$Bi$_2$Se$_3$ and CaSn$_3$ are two notable examples that have been studied extensively. Yet, proving the existence of the nematic superconducting state is challenging. Recent theoretical work predicts that odd-parity nematic SC should exhibit a unique magnetic...
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58. Field-Orientation-Dependent Magnetic Phases in GdRu$_2$Si$_2$ Probed with Muon-Spin SpectroscopyDr Benjamin Huddart (University of Oxford)2025-07-23, 11:20 a.m.
Centrosymmetric GdRu$_2$Si$_2$ exhibits a variety of multi-$Q$ magnetic states as a function of temperature and applied magnetic field, including a square skyrmion-lattice phase. The material’s behaviour is strongly dependent on the direction of the applied field, with different phase diagrams resulting for fields applied parallel or perpendicular to the crystallographic $c$ axis. Using...
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Andrin Doll (Paul Scherrer Institute)2025-07-24, 9:00 a.m.
Multi-quantum (MQ) spectroscopy allows to selectively probe anisotropic muonium. The principal idea is to resonantly drive MQ spin transitions, for which both the electron and the muon spin flip simultaneously (Fig. 1a). In the high-field limit of the electron spin, such MQ microwave excitations are only possible in presence of hyperfine anisotropy, as demonstrated recently for bond-centered...
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James Lord (ISIS)2025-07-24, 9:20 a.m.
The remarkable thermal, optical and mechanical properties of beryllium oxide lead to a number of applications, however little is known about the behaviour of hydrogen in BeO, which can be as high as 4% in thin films. We used positive muons as a model for hydrogen. Earlier TF data [1] shows both diamagnetic and muonium states and a large "missing fraction".
We measured the muonium fraction...
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Kazuhiko Ninomiya (Hiroshima University)2025-07-24, 9:40 a.m.
The small amount of carbon in steel (<1%), critical in determining its properties, strongly depends on steel production technology. Destructive methods have been generally used to quantify carbon. Still, non-destructive and bulk analysis methods are required from the perspective of quality control in steel production and the analysis of cultural heritages. We propose a novel method of...
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Dr Stephen Cottrell (UKRI, Rutherford Appleton Laboratory)2025-07-24, 10:00 a.m.
Radio-frequency muon spin resonance (RF-µSR) has been used to investigate the temperature dependence of the hyperfine parameters of the 2-Norbornyl radical formed in polycrystalline norbornene. Working at a fixed RF frequency of 170.5MHz, field scans show striking changes in both the resonance line shape and amplitude as the temperature is scanned through the plastic phase, with the signal...
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Hiroki Ueda (Paul Scherrer Institute)2025-07-24, 1:10 p.m.
Chirality — the geometric property defining the handedness of an object — is a fundamental concept with broad relevance across scientific disciplines. Recent advances have highlighted the pivotal role of chirality in condensed matter physics, particularly through the emergence of chiral phonons: vibrational excitations that carry angular momentum. These quasiparticles are of great interest due...
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Dr Jennifer Graham (PSI Center for Neutron and Muon Sciences CNM, Switzerland)2025-07-24, 1:40 p.m.
The kagome lattice has attracted significant attention in the condensed matter community due to its rich sequence of emergent quantum phases, including chiral charge order, nematicity, superconductivity, and the anomalous Hall effect. Theoretical studies predict that these materials may host unconventional superconducting states, such as chiral superconductivity, making the experimental...
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Gediminas Simutis (Paul Scherrer Institute)2025-07-24, 2:00 p.m.
The mineral averievite Cu5V2O10(CsCl) possesses a different structure compared to herbertsmithite and other Cu-based kagome spin liquid candidates. The kagome layers are separated by two spacer layers, instead of one in herbertsmithite, reinforcing the 2D character.
The pristine averievite is known to order magnetically at 24 K due to Cu2+ magnetic interlayers but these can be replaced...
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Benjamin Frandsen (Brigham Young University)2025-07-24, 2:20 p.m.
The antiferromagnetic semiconductor MnTe has recently attracted enormous research interest. Among other distinctions, MnTe has significance as a leading example of altermagnetism, a high-performance thermoelectric compound when lightly doped, and a platform for spintronics based on antiferromagnetic domains. Muon spin relaxation/rotation (µSR) studies of MnTe can help provide a more complete...
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Dr Zaher Salman (PSI)2025-07-24, 3:00 p.m.
Hybrid systems combining superconductors (SCs) with magnetic atoms or molecules have revealed a rich landscape of emergent phenomena, including the formation of localized electronic states at their interfaces, with promising implications for spintronics [1]. In contrast to atomic impurities, magnetic molecules offer chemical tunability, enabling tailored coupling strengths between molecular...
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Thomas Prokscha (Paul Scherrer Institute)2025-07-24, 3:20 p.m.
The manipulation and observation of charge carrier distributions at the interfaces of semiconductor device structures is a fundamental problem in semiconductor physics. Standard electrical characterization techniques, such as deep level transient spectroscopy (DLTS) or capacitance-voltage (CV) measurements, have limited depth resolution and are unsuitable to probe the nanometer scale regions...
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Prof. Giacomo Prando (Dipartimento di Fisica "Alessandro Volta", Università degli Studi di Pavia, Italia)2025-07-25, 9:30 a.m.
Metal-organic frameworks (MOFs) are composed of metal centres connected by organic polytopic ligands. Their high degree of chemical tunability is reflected in a controlled wide variability of the electronic states, among which magnetism. However, the main drawback against the realization of magnetic phases with high critical temperatures is the weak magnetic coupling between the metal centres...
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Wataru Higemoto (Advanced Science Research Center, Japan Atomic Energy Agency)2025-07-25, 9:50 a.m.
The effect of pressure on an organic material is large due to its flexibility, and various physical states such as metal-insulator transition, spin liquid and superconductivity appear. Therefore, systematic research under pressure is important to understand their electronic or magnetic nature. The organic material, $\lambda$-(BEDSe-TTF)$_2$GaCl$_4$, is a Mott insulator and antiferromagnetic...
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John Wilkinson (ISIS Neutron and Muon Source)2025-07-25, 10:10 a.m.
CsNiCrF$_6$ is a compound which exhibits multiple coulomb phases: charge ice, displacement ice and spin ice. Having all three of these Coulomb phases ensures that bulk techniques for measuring the dynamics in this compound struggle to grapple with the inherent disorder present [1], and density functional theory calculations on this compound are prohibitively expensive. In this talk, I will...
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Hirotaka Okabe (High Energy Accelerator Research Organization (KEK))2025-07-25, 10:50 a.m.
Critical phenomena at phase transitions in multiferroic materials remain not fully understood, and quantum beams drive the elucidation of the phenomena from the viewpoint of microscopic dynamical properties. BiFeO$_3$ is one of the most promising multiferroic materials with high antiferromagnetic ($T_N$$\sim$650 K) and ferroelectric ($T_C$$\sim$1100 K) transition temperatures [1]. We aim to...
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Murray Wilson (Memorial University of Newfoundland)2025-07-25, 11:10 a.m.
Skyrmion lattices (SkLs) are intriguing vortex-like spin textures with non-trivial topology [1,2]. While they are typically stabilized by antisymmetric interactions in bulk noncentrosymmetric materials, centrosymmetric SkL hosts, such as Gd$_2$PdSi$_3$ [2–4], have recently been discovered. There, both the SkL stabilization mechanism under applied fields and the zero-field ground states (GSs)...
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Signy L. Spencer (UBC and SBQMI)
The rutile crystal structure contains vacant channels along the tetragonal $c$-axis that provide both sites and a diffusion path for small interstitial impurities. Here, we present beta-detected nuclear magnetic resonance ($\beta$-NMR) measurements of the quadrupole splitting of implanted $^8$Li$^+$ in two isostructural rutile single crystals: TiO$_2$ and MgF$_2$. We compare our results with...
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Amba Datt Pant (KEK/J-PARC center)
Even though there are several muon spin rotation and relaxation ($\mu$SR) studies in water/ice [1-6], recently, we report the oscillation in the zero-field spectra of muons in ice which is attributed to the spin–dipole interactions between the muon in MuOH and neighboring protons and to hyperfine transitions of triplet states of axially symmetric anisotropic muonium in ice [7]. The Mu-H...
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Jess H. Brewer (UBC & TRIUMF)
Most $\mu$SR is done with the $\mu^+$ because 100% polarized surface muons have a fixed lifetime and usually retain their full polarization upon stopping in the sample, whereas the $\mu^-$ has higher energy, loses most of its polarization through $LS$ coupling during its cascade to the ground state of the muonic atom, and is then subject to capture on the nucleus, so its lifetime is variable...
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Francis Pratt (ISIS)
The organic charge transfer salt TTF-CA contains 1D chains with alternating molecules of the electron donor TTF and the electron acceptor chloranil (CA). At high temperatures the molecules are in a charge neutral state (N), but below 80 K there is an ionic state (I) with a partial charge transfer from TTF to CA. Various topological excitations are possible in this system [1], e.g. domain walls...
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Francis Pratt (ISIS)
Since the first measurements of muon quadrupolar level crossing resonance (QLCR) in Cu [1], the technique has been extended to various other quadrupolar atoms. For example, recent QLCR studies with N looked at a charge transfer salt [2] and the quantum delocalisation of the muon in solid N$_2$ [3]. Another recent study measured the kagome superconductor RbV$_3$Sb$_5$ and this has provided the...
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Dr Sydney Kreitzman (TRIUMF)Poster Presentation
A novel formulation of the strong-collision (SC) model is presented in terms of a "SC" projection operator. This very compact and concise notation is ideally suited for the systematic development of the dynamic time evolution of each isochromat in the static frequency spectrum via, for example, cumulant expansion. The resulting model is compared with a non-trivial case for which the strong...
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Ifeanyi John Onuorah (Department of Physics and Earth Sciences, University of Parma, IT-43124 Parma, Italy)
Muon spin rotation and relaxation spectroscopy is a well established experimental probe used to investigate the properties of a wide range of condensed matter systems. However, beyond the properties revealed directly by the best fit parameters of the experiment, computational methods can effectively quantify the microscopic interactions underlying the experimentally observed signal, thus...
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Hubertus Luetkens (PSI Center for Neutron and Muon Sciences CNM, 5232 Villigen PSI, Switzerland)
The quantum behavior of light nuclei and other particles in materials challenges classical intuition and introduces novel phenomena. Here we demonstrate that muon spin spectroscopy (μSR) is a powerful tool for exploring the quantum effects of light particles, such as the muon, in condensed matter. The muon’s quantum nature is profoundly influenced by the surrounding, offering a unique probe...
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Dr Masanori Miyazaki (Muroran Institute of Technology)
In perovskite Ta oxynitrides $A$TaO$_2$N ($A$=Ba, Sr), a new degree of freedom, $cis/trans$, is introduced by the anion configuration. In these materials, a dielectric constant of about 10$^2$-10$^3$ has been observed at room temperature. However, powder X-ray diffractions show structures such as $Pm\bar{3}m$ and ${I4/mcm}$, which have central symmetry and do not exhibit dielectric...
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Theo Breeze (Durham University)
NiI$_2$ is a layered van der Waals magnet which has recently been proposed to host a novel form of skyrmion phase in the 2D limit$^1$. $\mu$SR has proven to be a sensitive probe of magnetic dynamics resulting from such topological excitations. I will present the results$^2$ of $\mu$SR measurements of NiI$_2$, which probe magnetic phase transitions at $T_{\rm{N1}}=73$ K and $T_{\rm{N2}}=62$ K....
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Takashi Yamanaka (Kyushu University)
A silicon strip detector has been developed for positron tracking from muon decay at the J-PARC muon g-2/EDM experiment. The detector is composed of silicon strip sensors with a strip pitch of 190 μm and features a readout with a 200 MHz sampling clock. It can be operated at 25 Hz on the J-PARC MLF muon beam line. The application of the detector to μSR measurement at J-PARC MLF is being...
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Mikhail Yakovlev (Simon Fraser University)
The muon spin rotation ($\mu\text{SR}$) technique has been applied to determine the behavior of the in-plane magnetic penetration depth ($\lambda_{ab}$) in the vortex state of the unconventional superconductor Sr$_2$RuO$_4$ as a means of gaining insight into its still unknown superconducting order parameter. A recent $\mu\text{SR}$ study of Sr$_2$RuO$_4$ reported a $T$-linear temperature...
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Dr Jennifer Graham (PSI Center for Neutron and Muon Sciences CNM, Villigen PSI, Switzerland)
The bulk heterostructure 6R-TaS$_{2}$ offers a unique platform to study the interplay of charge density waves, superconductivity, and electronic transport anomalies. Notably, nematic Ising superconductivity has been recently proposed, and a hidden order accompanied by a large anomalous Hall effect at $T^{*}$ ${\simeq}$ 35 K has been identified, raising fundamental questions about the nature...
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Amba Datt Pant (KEK/J-PARC center)
In order to broaden the applications of muon across various research fields, develop the spectrometers and experimental areas dedicated to particular fields, we develop different secondary beamlines (experimental areas) at Muon Science Establishment (MUSE), Japan Proton Accelerator Research Complex (J-PARC) [1-6]. For the study of the functional properties of materials using surface muons, we...
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Koichiro Shimomura (KEK IMSS)
Muonium is a pure leptonic binary system consisting of a positive muon and an electron, and its level structure can be calculated with high precision. The Muonium Spectroscopy Experiment Using Microwave (MuSEUM) experiment aims to verify the quantum electromagnetic dynamics theory and determine the positive muon magnetic moment and mass by precise measurements of the ground-state hyperfine...
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Prof. Javier Campo (Aragón Nanoscience and Materials Institute (CSIC-University of Zaragoza))
In cubic chiral magnets, Dzyaloshinskii-Moriya (DM) interactions within the chiral crystal structure result in diverse magnetic textures, including skyrmion lattices (SkL) and chiral soliton lattices, which hold promise for spintronic and magnonic devices. Among these, MnSi has been extensively studied due to the SkL formation in the so-called “A-phase” just below Tc.
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Recently, it was... -
Jennifer Graham (Paul Scherrer Institute)
In recent years, there has been an influx of research surrounding the kagome AV$_3$Sb$_5$ (A = K, Rb, Cs) compounds which display both superconductivity and charge order [1,2]. The onset of charge order has been associated with the breaking of time-reversal symmetry (TRS), but the extent to which TRS breaking can be tuned is relatively unexplored. To address this, we employ muon spin rotation...
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Prof. Qiang Li (China Spallation Neutron Source)
The Phase II upgrade project of the China Spallation Neutron Source (CSNS) includes the construction of a surface muon beam line and a muon spin rotation/relaxation/resonance (μSR) spectrometer, which will be the first μSR spectrometer built in China. Here, we report the conceptual design of the spectrometer, including the detector arrangement, magnets, sample environment (SE) and sample...
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Prof. Yasuhiro Miyake (KEK)
High-speed charged particles (such as electrons) are scattered in matter by the electric field of the atomic nucleus producing the Bremsstrahlung X-rays (light). Since the efficiency of Bremsstrahlung is inversely proportional to the square of the mass, in principle, $\mu^{\pm}$ which is 200 times heavier than an electron, can produce 40000 times less Bremsstrahlung than an electron. On the...
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Soshi Ishitani (Osaka University)
$\mu$SR is a spectroscopy using a spin-polarized muon beam. It is a method to observe the muon spin rotation, relaxation and resonance by using the detection of positrons emitted asymmetrically to the muon spin axis, and is widely used as one of the physical property methods to search for magnetic fields inside materials. However, the conventional $\mu$SR can only measure physical properties...
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Makoto Fukushima (The University of Osaka)
$\mu$SR is a powerful technique for probing internal magnetic fields and their dynamic behavior and it has been widely used in the study of magnetic and superconducting materials. However, due to limitations such as the relatively small sample volume, there are very few experimental reports of $\mu$SR under high-pressure conditions exceeding 10 GPa.
To address this challenge, we are...
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Dr Petr Kral (PSI Center for Neutron and Muon Sciences CNM, Switzerland)
The interplay between superconductivity and charge or spin order is a key focus in condensed matter physics, with kagome lattice systems providing unique insights [1-9]. We recently discovered that the kagome superconductor LaRu$_{3}$Si$_{2}$ ($T_{\rm c} \simeq 7$ K) exhibits a characteristic kagome band structure and a hierarchy of charge-order transitions at 400 K and 80 K, as well as an...
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Iain McKenzie (TRIUMF)
The dynamics of polymer glasses have been shown to be enhanced within a few nanometers of an interface. This enhanced surface mobility has technological implications for processing and applications of glasses. An open question is how the chemical structure of a polymer affects the dynamics in the near surface region, but this is extremely challenging to study. Previous studies using bulky...
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Masatoshi Hiraishi (KEK-IMSS)
While ruthenium oxide RuO$_2$ with a rutile structure has long been regarded as a Pauli paramagnetic metal, it has recently attracted much attention as a candidate for the “altermagnet". The existence of an antiferromagnetic (AFM) order, essential for the altermagnet, has been claimed by recent neutron diffraction study [1]. However, the reported Ru magnetic moment size $|m_\mathrm{Ru}|$ =...
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Adrian Hillier (ISIS Neutron and Muon Facility)
The science program of elemental analysis is a rapidly expanding area, with applications ranging from cultural heritage to energy materials to advanced manufacturing. Negative muons are an excellent tool for determining the composition of a material, non-destructively, as a function of depth. EVA (Elemental, Visualisation and Analysis) is a new software package that is user-friendly and...
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Jonas A. Krieger (Paul Scherrer Institute)
Typical time spectra measured in muon spin spectroscopy ($\mu$SR) are histograms of the detected positron times from one or multiple positron detectors as a function of time after implantation of the muon. In experiments at continuous muon beams, an online event logic is applied to the incoming streams of single detector hits [1,2]. Its two main purposes are (i) data reduction by multiple...
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Shoichiro Nishimura (KEK IMSS)
$\mu$SR in high magnetic fields is a powerful technique for probing material structures, enabling detailed measurements such as the muon Knight shift and level-crossing resonance (LCR). To advance such studies, we are developing a high-field µSR spectrometer named CYCLOPS, designed to operate in magnetic fields up to 5 tesla in the Materials and Life Science Experimental Facility (MLF) at...
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Mr River Tranter-Tiffin (Queen's University), Sarah Dunsiger (TRIUMF / Simon Fraser University)
The current beta-NMR/beta-NQR spectrometers in ISAC-1 at TRIUMF constitute a unique research tool, enabling spin polarised ions (typically 8Li+) to be controllably implanted at a depth of between 5 – 200 nm within a material for investigations of thin films and artificial heterostructures. This involves decelerating 8Li+ beams through the generation of a “hill” in the electrostatic potential...
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Jun Sugiyama (CROSS Neutron Science and Technology Center)
Internal nuclear magnetic fields in various battery materials have been predicted using density functional theory (DFT) calculations to interpret the $\mu^+$SR results, particularly for identifying the diffusing species responsible for the dynamic behavior observed. In materials where Li$^+$ and Na$^+$ ions are mobile, these cations readily change positions to minimize electrostatic repulsion...
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Soshi Takeshita (KEK IMSS Muon)
The D-line at the MUSE facility of the J-PARC MLF delivers high-intensity, spin-polarized muon beams of both positive and negative. Positive muons implanted into organic materials tend to form paramagnetic muoniated radicals at various sites, sometimes making it difficult to identify precise local environments. In contrast, negative muons are captured by atomic nuclei, resulting in...
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Izumi Umegaki (KEK (High Energy Accelerator Research Organization))
Muonic x-ray has been used for an elemental analysis in various research fields. We have applied this technique to detecting metallic Li, which increases the risk to safety in a Li-ion battery. In our study, we found that metallic Li on the graphite anode can be detected with high sensitivity using muonic x-rays while less muon is captured by Li atoms in the anode.
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Since metallic Li is... -
Philip Jones (School of Engineering, University of Warwick, UK.)
The value of the nuclear charge radius depends on features of the nuclear structure such as the nuclear charge distribution, ρ, which has been systematically measured for almost all stable nuclei.
The nuclear charge radius can be mathematically defined using ρ, which in turn can be deduced from the X-ray transition energies of a muonic atom. The binding energy of the muonic atom is...
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Dr Ryan McFadden (TRIUMF Inc.)
Surface treatments are an integral step in the preparation of superconducting radiofrequency (SRF) cavities fabricated using Nb, which are often used in particle accelerators. Common treatment approaches involve "baking" the metal in vacuum or a gaseous atmosphere at temperatures < 200 °C (see, e.g., [1]), causing light chemical doping of its subsurface up to depths of ~100 nm. As this...
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Xiao Zhao (Paul Scherrer Institute)
Muon-Induced X-ray Emission (MIXE) is considered the only technique that allows for non-destructive elemental analysis of the bulk of a sample, with depth-profiling capabilities. Powered by the high-rate continuous muon beam from the Swiss Muon Source (S$\mu$S) at PSI, MIXE has undergone a remarkable revival [1] and has already demonstrated significant advancements [2–4]. To further strengthen...
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Oral invited talk. This category is for invited speakers only.
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Benjamin Orton (STFC)
DGEBA is used in many dielectric systems. Understanding factors that influence its performance and longevity require a knowledge of charge dynamics, which intrinsically are linked to the molecular structure and dynamics. Bulk techniques have been used to determine structural relaxations and activation energies; however, these methods only provide information on processes, not on the causal...
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Nicholas Oudejans (University of Guelph)
The oxidative corrosion of steel in nuclear reactors is worsened by the removal of steel's passivizing oxide layer by flow-accelerated corrosion (FAC). Free radicals and hydrogen (H) species in feedwater greatly affect the rate of corrosion; film-forming amines (FFA) are therefore a candidate method to reduce FAC in the coolant systems of nuclear reactors by creating a barrier which limits the...
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Jincheng Huang (Memorial University of Newfoundland)
MnGe is a B20 cubic magnetic material observed to host nanoscale topological spin textures. Previous measurements by bulk µSR and small-angle neutron scattering have shown a 3-6 nm helimagnetic state below 200K and a possible 3D skyrmion lattice [1-3]. To further study this material, we have grown high quality crystalline MnGe thin films. With thickness of only a few helical wavelengths,...
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Jun Sugiyama (CROSS Neutron Science and Technology Center)
GdNi$_4$B is currently one of the optimal magnetocaloric materials for hydrogen liquefaction, but the exact theoretical causes for that are unknown. GdNi$_4$B is a metallic compound exhibiting a ferromagnetic transition at around 50 K, below which they work as a magnetic refrigeration material. Therefore, their ferromagnetic structures should play a key role to determine their optimal magnetic...
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Prof. Javier Campo (Aragón Nanoscience and Materials Institute (CSIC-University of Zaragoza))
Equilateral spin triangles are pivotal in quantum magnetism to explore frustration, spin–electric coupling, and multiferroic ordering. Achieving ideal triangular spin networks is difficult due to structural distortions, but the organic compound TNN·CH3CN overcomes these limitations with isotropic spins free from Jahn–Teller effects, enabling uniform exchange interactions and making it an...
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Michael Graf (Boston College)
We report $\mu$SR measurements on the layered triangular system NaYb$_{1-x}$Lu$_{x}$O$_{2}$ with $x$ = 0.05 and 0.15. We find the quantum disordered ground state [1,2] to be robust and insensitive to magnetic dilution, and exhibiting persistent spin dynamics down to the lowest temperature studied (T = 0.25 K). Indeed, the low temperature muon response is nearly identical to that found for...
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Nathan Bentley (University of Durham)
The intercalated transition-metal dichalcogenides (TMDCs) are formed through the insertion of transition-metal ions between weakly bonded hexagonal layers. The low dimensionality of these systems leads to the realisation of a wide range of magnetic phenomena, which is further enhanced by varying the species and stoichiometry of the intercalate [1]. The sensitivity of muons to local magnetism...
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Yipeng Cai (Columbia University)
We study the magnetic properties of the metallic kagome system (Fe$_{1-x}$Co$_x$)Sn by a combination of $\mu$SR, magnetic susceptibility and STM measurements, in single crystal specimens with Co concentrations $x=0,0.11,0.8$. In FeSn, we find possible signatures for a previously unidentified phase that sets in at $T^*\sim 50$ K, well beneath the Neel temperature $T_N \sim 376$ K, as indicated...
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Mr Ishant Ishant (Shiv Nadar Institution of Eminence, Greater Noida, Delhi-NCR)
A field-induced quantum spin liquid (QSL) state is an extraordinary phenomenon, hitherto unobserved in metallic frustrated compounds. CePdAl (CPA), a magnetically frustrated metallic compound with a kagome lattice, presents a unique opportunity to explore this phenomenon~\cite{Kitazawa1994}. Recent bulk measurements have revealed intriguing magnetic states in CPA when a magnetic field is...
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Vladimir Kozhevnikov (Tulsa Community College)
By definition, properties of the S (superconducting) state are determined by Cooper pairs (CP). The pairs' mobility allows them to organize into a perfectly ordered lattice of microwhirls (MW) formed by the field induced currents in CPs, thereby reducing entropy of the pairs’ ensemble down to zero. The latter entails zero temperature of the ordered CPs, one of the consequences of which is zero...
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Osamu Sugino (The Institute for Solid State Physics, The University of Tokyo)
The μSR experiment has been used to measure diffusion coefficients and activation energies of ions in cathode materials such as LiCoO2. [1] However, direct determination can be challenging due to the use of models such as the Kubo-Toyabe dynamic function, as well as difficulties in distinguishing muon diffusion itself from Li+ diffusion at high temperatures.
First principles calculations...
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Philip Jones (philip.d.jones@warwick.ac.uk)
Muonic X-ray Emission Spectroscopy is a non-destructive method of elemental analysis, which has recently been adopted several fields, such as cultural heritage. It is desirable to have a robust way of computationally modelling these experiments, to allow for simpler and more systematic identification of elemental X-ray intensities, particularly in samples consisting of multiple elements....
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Sohtaro Kanda (KEK)
Muonium, a pure leptonic two-body system, is a powerful probe for precise QED tests and new physics searches. High-precision spectroscopy of muonium provides the best determination of the muon-to-electron mass ratio. For instance, muonium ground-state HFS microwave spectroscopy determined the mass ratio to 120 ppb [1]. Uncertainty in theoretical predictions for QED tests and new physics...
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Katie Curvelo
In order to make eco-friendly energy sources more widely available, there is an interest in manufacturing more efficient solar cells. This can be done by finding appropriate abundant materials that require less intensive production and typically at a lower cost. For this purpose, lead halide perovskites (APbX$_3$, A is an alkyl ammonium cation and X is a halide ion) have been researched...
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Dr Ryan McFadden (TRIUMF Inc.)
A superconductor’s intrinsic length scales – the London penetration depth λL and Bardeen-Cooper-Schrieffer (BCS) coherence length ξ0 – are closely connected to its electronic structure and govern salient features such at its Meissner response. Leveraging recent advances in the preparation [1] and characterization [2] of Nb metal for technical applications (e.g.,...
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Stephen Blundell (University of Oxford)
The F--$\mu$--F state is observed in many fluorides via the quantum coherent oscillatory muon polarization resulting from entanglement between the spins of the muon and nearby fluorine nuclei [1,2,3]. The usual method to treat muon hopping in this system is to use the strong-collision approximation to dynamicize the standard F--$\mu$--F relaxation function [4]. This approach neglects...
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John Wilkinson (ISIS Neutron and Muon Source)
Muon spin relaxation has been very successfully used to observe the dynamics in a range of materials, and electronic dynamics typically manifest themselves by showing a muon spin relaxation function which decays exponentially with time, with the rate of decay being related to the field autocorrelation function which can then be used to extract the dynamical parameters of the system [1]....
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Michal Kiaba (Northwestern University)
We report on the magnetic properties of two sets of superlattices composed of antiferromagnetic LaFeO$_3$, separated by either SrTiO$_3$ or LaAlO$_3$. The superlattices consist of 1, 2, or 3 unit cells of LaFeO$_3$, separated by 5 unit cells of SrTiO$_3$ in one set, and 5 unit cells of LaAlO$_3$ in the other, each repeated 10 times. The magnetic behavior was investigated using low-energy muon...
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John Wilkinson (ISIS Neutron and Muon Source)
One of the key challenges in performing experiments is knowing which temperatures and applied fields to measure at, and how many statistics should be measured at each temperature/field combination. We have recently developed a technique which uses Fisher information which, for a given muon asymmetry function, can analytically calculate the number of muon statistics required to have an error of...
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Vladimir Kozhevnikov (Tulsa Community College)
The standard interpretation of superconductivity (S) is based on the London theory (LT) with minor modifications adopted in the GL and BCS. In all theories the sample bulk is totally inert and microscopic parameters of the S state can be obtained exclusively from the surface properties, i.e., the penetration depth $\lambda$ and the induction profile B vs depth z. Herewith, $B(z)$ is or close...
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Emmelyne Cuza (University College Dublin)
A novel domain wall architecture has recently been discovered in molecular crystals of the ferroelastic Mn³⁺ spin crossover compound [MnIII(3,5-diCl-sal₂(323))]BPh₄.[1] This complex exhibits a two-step thermal spin transition between the d⁴ spin triplet and spin quintet states, with a spin-state ordered phase forming at low temperatures. Single-crystal X-ray diffraction identified three...
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Peter Baker (ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory)
Battery materials can undergo a series of structural phase transitions during cycling that significantly change the ionic diffusion. In-operando $\mu$SR measurements provide a powerful new tool to investigate the ionic diffusion in these intermediate phases that affect both the performance and longevity of batteries.
Here we report in-operando $\mu$SR measurements of the battery...
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Kwang Yong Choi (Sungkyunkwan University)
Si:P offers a versatile setting for exploring quantum many-body effects. At intermediate impurity concentrations, Si:P hosts a Kondo condensate—a quantum state featuring an energy gap in the electronic density of states. In this regime, overlapping Kondo clouds interact via RKKY exchanges, though the nature of the magnetic ground state has remained unclear.
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In this presentation, we combine... -
Dr Anshu Kataria (Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Universit\`a di Parma, I-43124 Parma, Italy)
AV$_3$Sb$_5$ (A = K, Cs,and Rb) V-based kagome metals have attracted significant attention owing to the intricate interplay between electronic correlations and nontrivial band topology, including features such as flat bands and van Hove singularities [1,2]. These systems host intertwined electronic instabilities [3], leading to a complex phase diagram between the charge density wave...
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Tom Lancaster (Durham University)
The search for states of matter such as quantum spin-liquids involves the characterization of disordered magnetic ground states, and spinons or topological excitations, along with signatures of entanglement [1]. Examples of these features are also found in one-dimensional spin chains. Here we describe our recent $\mu$SR work on such systems built from metal centres linked by molecules.
We...
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Masatoshi Hiraishi (KEK-IMSS)
The $\mu$SR method has been widely used in recent years to study ion diffusion in battery materials. In data analysis, a dynamic Kubo-Toyabe function is often used in which the internal magnetic field distribution $n(B)$ fluctuates with frequency $\nu$. The model also presumes that $n(B)$ at the muon site remains constant and uncorrelated between fluctuations [1]. However, it has been pointed...
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Wataru Higemoto (Advanced Science Research Center, Japan Atomic Energy Agency)
Hydrogen is known to degrade the performance of structural materials, a phenomenon commonly referred to as "hydrogen embrittlement". Hydrogen embrittlement is a well-known phenomenon in high strength materials and is responsible for subcritical crack growth in the material, fracture initiation and catastrophic failure with subsequent loss of mechanical properties such as ductility, toughness...
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Tobias Junginger (University of Victoria and Triumf)
The performance of superconducting cavities in particle accelerators is limited by magnetic flux behavior in the near-surface region, where radiofrequency currents flow. Muon spin rotation (μSR) and beta-detected nuclear magnetic resonance (β-NMR) are uniquely suited to investigate this regime, offering access to local magnetic properties with depth resolution on the nanometer scale. This...
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Gediminas Simutis (Paul Scherrer Institute)
YbBO₃ is an intriguing example of a geometrically frustrated magnet. Early muon spin spectroscopy study reported an increase in the muon depolarization rate below 400 mK, but no oscillations indicative of long-range order were detected [1]. In contrast, subsequent investigations using other experimental techniques revealed that YbBO₃ does indeed undergo magnetic ordering [2]. A recent proposal...
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Dipranjan Chatterjee (University of Oxford)
Conventional μSR lacks external control over local muon–spin interactions; to overcome this limitation, we employed pulsed RF techniques to manipulate spin populations in muon-coupled fluoride systems at precisely controlled times after muon implantation, utilizing the ISIS pulsed muon beamline—well suited for such experiments. In ionic fluoride insulators, implanted μ$^+$ forms an F–μ–F...
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Sarah Dunsiger (TRIUMF / Simon Fraser University)
The magnetic excitation spectrum in a material of interest is governed by the interactions between spins within the lattice. Muon spin relaxation, beta detected nuclear magnetic resonance and the complementary technique of inelastic neutron scattering, among others, yield unique knowledge of the dynamic response of the system. However, the nature of the excitation spectrum at low energies...
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Andrew MacFarlane (UBC Chemistry)
We report β-NMR spin-lattice relaxation of 8Li+ implanted at 25 keV into polycrystal samples of the high entropy oxides (Co1/5 Cu1/5Mg1/5 Ni1/5Zn1/5 )O with the rocksalt (RS) structure and (Co1/5 Cr1/5Fe1/5Mn1/5Ni1/5 )3 O4 with the spinel (Sp) structure in a high applied longitudinal field of 5.65 T. Both are magnetic materials with a high degree of cation disorder. In the RS, occupation of...
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Shunsuke Asari (Osaka University)
Repeated recharging of lithium-ion batteries leads to the deposition of metallic lithium (m-Li) on the anode surface. Visualizing the spatial distribution of m-Li is challenging with existing techniques. Furthermore, lithium can also be deposited in the form of insoluble salts (s-Li) within the battery, making it essential f for visualization methods that distinguish between these two lithium...
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Thomas Hicken (Paul Scherrer Institute)
Altermagnetism has recently emerged as a third fundamental class of magnetism [1], with spin-spilt bands but no net magnetisation. As well as being of fundamental interest, this magnetic state has some properties of both ferromagnets and antiferromagnets which are particularly interesting for spintronic applications [2]. Key to altermagnetism is rotational symmetry between flipped magnetic...
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Dr Alex Louat (ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory)
Super-MuSR is a project to upgrade the MuSR beamline at ISIS to significantly increase its resolution and counting rate as part of the ISIS Endeavour programme of new and upgraded instruments. Here we report on project progress and component test results.
The beamline upgrade will add pulse slicing and spin rotation capabilities that increase the time resolution by a factor of ten and...
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Md Asaduzzaman (University of Victoria, BC, Canada)
We present a study of the normal-state and superconducting properties of thin-film $\mathrm{Nb_{1-x}Ti_{x}N}$ using depth-resolved $^8$Li $\beta$-detected nuclear magnetic resonance ($\beta$-NMR). Spin-polarized $^8$Li$^{+}$ ions were implanted ~21 nm into a Nb$_{0.75}$Ti$_{0.25}$N(91 nm)/AlN(4 nm)/Nb sample, with their NMR response recorded at temperatures between 4.6 K to 270 K under a 4.1 T...
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Kenji Kojima (TRUIMF), Mohamed Oudah (SBQMI, UBC)
CaSb2 has been identified as a topological semimetal [1] and a bulk superconductor[2,3]. We investigate the superconducting state and the spontaneous magnetism using muon spin-relaxation (µSR) [4]. Zero-field muon relaxation shows little temperature dependence when the muon-spin is parallel to the c∗-axis, while an increase in relaxation appears below 1 K when the muon-spin is parallel to the...
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Dr Andreas Suter (PSI)
LaAlO$_3$ (LAO) is, alongside SrTiO$_3$ (STO), and sapphire one of the most commonly used substrates for complex metal-oxide thin film growth. LAO plays a crucial role in inducing interesting physical properties, such as in LaNiO$_3$/LAO superlattices and interface superconductivity at STO/LAO interfaces. While $\mu$SR studies have characterized STO, sapphire, and LSAT regarding Muonium...
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Amba Datt Pant (KEK/J-PARC center)
Due to the highest electronegativity of F ions, the highest electrical conductivity of fluorides [1] and the higher energy density (estimated theoretically [2]) than Li-ion batteries, metal fluorides attracted the attentions for all-solid-state battery materials for next generation. Since muon spin rotation and relaxation ($\mu$SR) method is used to study the dynamics of ions in battery...
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Pascal Isenring (Paul Scherrer Institute)
The use of a Si pixel-based particle tracking scheme in μSR will, among others, allow measurements using a ten-fold increased stopped muons rate and samples ten times smaller than currently possible at continuous muon source facilities. In this contribution we present simulation results to assess the effects of magnetic fields on two spectrometer configurations using a two-layered tracking...
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Adrian Hillier (ISIS Neutron and Muon Facility)
The objective of the FAMU experiment is to carry out a precision measurement of the muonic hydrogen ground state hyperfine splitting (1S-hfs), with an unprecedented accuracy of the order of $10^{-5}$. This measurement would enable to extract the Zemach radius of the proton with an accuracy better than 1%, which will give precise insights on the structure of the proton, and play a crucial role...
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Andrew MacFarlane (UBC Chemistry)
The perovskite rare-earth R nickelates, RNiO$_3$, are the prototypical example of a metal-insulator transition in a strongly correlated metal. The transition can be tuned by choice of R, but LaNiO$_3$ remains a metal. In superlattices (SLs) with interlayers of LaAlO$_3$, LaNiO$_3$ can be driven insulating and antiferromagnetic if they are thin enough [1]. We used $^8$Li $\beta$-NMR, to study...
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Francis Pratt (ISIS)
The Kubo-Toyabe (KT) function has long been a mainstay of studies of ionic diffusion in solids. Its usefulness has extended far beyond its expected range of applicability. One of the assumptions of the KT theory is that there is a Gaussian distribution of internal fields reflecting the contributions of a dense array of nuclear spins surrounding the muon site. In many cases this is clearly not...
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Hans-Henning Klauss (TU Dresden, Germany)
We study the μ+ dynamics in CaF2 in a wide temperature range between 10K and 290K using ZF and LF μ+SR experiments. The analysis of the muon spin polarization function A(t) at all temperatures in zero field (figure (a)) and longitudinal magnetic field is done by a quantum simulation of the static muon spin interacting with 2 nearest neighbor and 8 next-nearest neighbor flourine nuclear moments...
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106. Understanding Rome’s Ancient Past: An Analysis of Gold and Silver Coinage from the Roman EmpireAdrian Hillier (ISIS Neutron and Muon Facility)
The fineness and quality of a state’s coinage is often used as a proxy for its fiscal health, meaning the purity and chemical composition of coins are of real historical interest. Sampling of such objects is often at the surface or near-surface, but, in ancient coinages, these areas can be unrepresentative of the bulk alloy. Investigations on Roman gold and silver coinage using negative muons...
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James Lord (ISIS)
The ISIS muon beamlines have been operating for nearly 40 years and we have recently undertaken a phased programme of refurbishment. We give an overview of the work and performance improvements obtained.
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The first muon beamline at ISIS started operation in 1987, and in 1993 the EMU and DEVA (now HIFI) ports were added. In 2013 we replaced the front end quadrupole doublet with a larger... -
Dr Adam Berlie (ISIS Neutron and Muon Source)
Copper-exchanged zeolites have emerged as promising catalysts for the direct conversion of methane to methanol, yet the precise nature and dynamics of the active copper species remain elusive. In this study, we apply muon spin spectroscopy (µSR) to investigate local magnetic and electronic environments in Cu-loaded SSZ-13 zeolites, a technique uniquely sensitive to "slow" and local dynamic...
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Pascal Isenring (Paul Scherrer Institute)
Vertex-reconstructed μSR (vx-μSR) leverages thin tracking detectors to record incoming muon and emitted positron trajectories, enabling unprecedented capabilities in spatially resolved spectroscopy. This approach overcomes critical limitations of conventional μSR at continuous beam facilities by operating at higher stopped muon rates (>400 kHz) and resolving sub-millimeter sample regions....
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Murray Wilson (Memorial University of Newfoundland)
Fe$_3$GeTe$_2$ is a quasi-2D itinerant ferromagnet with a Van-der-Waals layered structure that exhibits substantial magnetic anisotropy. In bulk samples, this material becomes magnetically ordered below 200 K, although the low-temperature magnetic state for pure samples is debated, with some data suggesting a succession of two similar ferromagnetic states, and some suggesting a transition...
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Dr Iain McKenzie (TRIUMF, Simon Fraser University, University of Waterloo)
LiNi$_{0.8}$Mn$_{0.1}$Co$_{0.1}$O$_2$, commonly known as NMC811, is widely used as a cathode material in Li-ion batteries for electric vehicles due to its high energy density. Despite this, NMC811 and other Ni-rich layered cathode materials suffer from poor cycle life when compared to their lower Ni-containing analogues. This is caused by mechanical stress induced by anisotropic evolution of...
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Edward Thoeng (TRIUMF)
A new beamline called "β-SRF" has been built at TRIUMF, allowing for the near surface characterization of materials with β-radiation-detected nuclear magnetic resonance (β-NMR) in applied magnetic fields up to 200 mT parallel to the sample surface. These capabilities are relevant for the study of Nb superconducting radiofrequency (SRF) cavities - common components in particle accelerators -...
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Mr Miyahara Hiroaki (Muroran Institute of Technology)
In muon spin rotation/relaxation ($\mu$SR) experiment, the time evolution of muon spin polarization, $P(t)$, is analyzed to evaluate the internal magnetic fields and their temporal fluctuations sensed by the muons at their stopping sites. In conventional data analysis, a phenomenological model for $P(t)$—typically based on general spin relaxation theory (e.g. that by Kubo and Toyabe) —is used...
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Andrin Doll (Paul Scherrer Institute)
To extend μSR to driven samples, we employ a microwave stimulus to excite the sample by ferromagnetic resonance (FMR) and probe the resultant effect with the muon. The experiments were performed on the helimagnet Cu$_2$OSeO$_3$, which exhibits distinct FMR and μSR signatures throughout its magnetic phase diagram. FMR excitations in the helical state cause precession, which is characterized by...
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