Lattice Instability of UTe$_2$ Studied by Ultrasonic Measurements

Keita Ushida; Tatsuya Yanagisawa; Ruo Hibino; Masato Matsuda; Hiroyuki Hidaka; Hiroshi Amitsuka; Georg Knebel; Jacques Flouquet; Dai Aoki

doi:10.7566/JPSCP.38.011021

Lattice Instability of UTe$_2$ Studied by Ultrasonic Measurements

Superconductivity 2023-07-07 v1 Strongly Correlated Electrons

Authors: Keita Ushida , Tatsuya Yanagisawa , Ruo Hibino , Masato Matsuda , Hiroyuki Hidaka , Hiroshi Amitsuka , Georg Knebel , Jacques Flouquet , Dai Aoki

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Abstract

The elastic constants of an unconventional superconductor, UTe $_2$ , were investigated using ultrasound. In this paper, we report the elastic response of the normal state at temperatures down to 2 K and up to 14 T for $H \parallel b$ at ambient pressure. The transverse ultrasonic mode $C_{55}$ , which corresponds to the strain susceptibility of $\varepsilon_{zx}$ , shows softening with decreasing temperature, whereas the $C_{44}$ and $C_{33}$ modes do not show such softening. This clear mode dependence strongly suggests that UTe $_2$ has a lattice instability for this specific symmetry.

Keywords

ute2 unconventional superconductor ultrasonic measurement elastic constants lattice instability c55 softening

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@article{arxiv.2211.08354,
  title  = {Lattice Instability of UTe$_2$ Studied by Ultrasonic Measurements},
  author = {Keita Ushida and Tatsuya Yanagisawa and Ruo Hibino and Masato Matsuda and Hiroyuki Hidaka and Hiroshi Amitsuka and Georg Knebel and Jacques Flouquet and Dai Aoki},
  journal= {arXiv preprint arXiv:2211.08354},
  year   = {2023}
}

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Proceedings of 29th International Conference on LOW TEMPERATURE PHYSICS

Lattice Instability of UTe$_2$ Studied by Ultrasonic Measurements

Abstract

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