Lattice Instability of UTe2 Studied by Ultrasonic Measurements
Abstract
The elastic constants of an unconventional superconductor, UTe2, 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 b at ambient pressure. The transverse ultrasonic mode C55, which corresponds to the strain susceptibility of zx, shows softening with decreasing temperature, whereas the C44 and C33 modes do not show such softening. This clear mode dependence strongly suggests that UTe2 has a lattice instability for this specific symmetry.
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