Events in our system are self-managed.  Group and event managers are encouraged to review privacy and security settings, and adjust them if needed.  If you need assistance please contact Indico Support - contact Help at bottom of page. https://learn.getindico.io/categories/managing/

Operando µSR Experiments on Palladium Hydride

21 Jul 2025, 14:10
20m
Contributed Oral Hydrogen isotopes in matter Oral Contributions

Speaker

Prof. Akihiro Koda (KEK/J-PARC)

Description

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 temperatures as low as 9K. In particular, experimental results comparing hydrogen and deuterium absorption show that deuterium-absorbed samples exhibit a higher superconducting transition temperature, which is the opposite tendency of the so-called isotope effect that has long been known and has attracted much attention [1].
We have constructed a cryostat and gas handling system for in-situ observation of hydrogen absorption by the operando µSR technique and observed hydrogen in palladium at low temperatures. A hydrogen concentration of x=0.87 can be achieved by absorption at 150 K. The zero-field µSR time spectrum is well fitted by the Kubo-Toyabe function, and the muon spin relaxation rate is in good agreement with the theoretical prediction when hydrogen occupies the octahedral O-site. Furthermore, a comparison with the experimental results for x=0.7 shows that the muon spin relaxation rate increases with increasing the hydrogen concentration.

  1. T. Kawae et al., J. Phys. Soc. Jpn. 89, 051004 (2020).
Email coda@post.kek.jp
Did you request an Invitation Letter for a Visitors Visa Application No

Primary author

Prof. Akihiro Koda (KEK/J-PARC)

Co-authors

Prof. Hideki Araki (The University of Osaka) Prof. Katsuya Shimizu (The University of Osaka) Kei Komatsubara (The University of Osaka) Kei Matsumoto (The University of Osaka) Koichiro Shimomura (KEK IMSS) Makoto Fukushima (The University of Osaka) Masaki Otsuka (The University of Osaka) Masami Kusumoto (The University of Osaka) Prof. Masataka Mizuno (The University of Osaka) Masayoshi Kamon (The University of Osaka) Dr Miki Fukutome (Niigata University) Dr Mototsugu Mihara (The University of Osaka) Ryosuke Takahagi (The University of Osaka) Shotaro Maesato (The University of Osaka) Soshi Ishitani (Osaka University) Sota Katsumoto (The University of Osaka) Mr Takato Sugisaki (The University of Osaka) Wataru Higemoto (JAEA ASRC) Mr Yuto Shigeta (The University of Osaka)

Presentation materials