Speaker
Description
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 (T$_{CDW}$) and superconducting transition (T$_C$).
In this talk, I will present our recent investigation of these compounds using quadrupolar level crossing resonance (QLCR)[4]. We observed a subtle change around T$_{CDW}$, while a significant shift in the resonance frequency and its depth is observed at a temperature between T$_{CDW}$ and T$_C$ [5]. This is associated with a rearrangement of the charge density and the possibility of significant charge fluctuations within the CDW state. These findings agree with previous μSR, NMR and STM spectroscopy results, showing a complex electronic phase diagram in V-based kagome systems [2,3].
References:
[1] B. R. Ortiz, et al. PRL v125,247002 (2020); B. R. Ortiz, et al. PRM 5,034801 (2021); S. D. Wilson et al. Nat. Rev. Mats 9, 420 (2024).
[2] R. Khasanov et al. PRR 4 023244 (2022); Z. Guguchia et al. Nat. Comm. 14, 153 (2023); C. Mielke et al. Nature 602, 245 (2022).
[3] Y. Xu, et al. Nat. Phys. 18 1470 (2022); L. Zheng, Nat. 611,7937 (2024).
[4] R. Kadono, et al. J. Phys. Soc. Jpn. 69, 3189 (2000).
[5] P. Bonf`a, et al. arXiv:2411.04848v1 (2024).
| anshu.kataria@unipr.it | |
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