Anisotropic Elastic Properties of CeRhIn$_{5}$

TL;DR

This study investigates the elastic properties and structural response of CeRhIn$_{5}$ under high pressure, revealing complex behavior without a simple correlation between lattice parameters and superconducting transition temperature.

Contribution

It provides comprehensive measurements of elastic moduli and structural changes of CeRhIn$_{5}$ under pressure, highlighting differences from doping effects.

Findings

Bulk modulus approximately 78 GPa

Uniaxial compressibilities $\kappa_{a}$ and $\kappa_{c}$ measured

No linear correlation between $c/a$ ratio and $T_c$ under pressure

Abstract

The structure of the quasi two dimensional heavy fermion antiferromagnet CeRhIn$_{5}$ has been investigated as a function of pressure up to 13 GPa using a diamond anvil cell under both hydrostatic and quasihydrostatic conditions at room (T=295 K) and low (T=10 K) temperatures. Complementary resonant ultrasound measurements were performed to obtain the complete elastic moduli. The bulk modulus ($B\approx 78$ GPa) and uniaxial compressibilities ($\kappa_{a}$ $=3.96\times $ $10^{-3}$ GPa$^{-1}$ and $% \kappa_{c}$ $=4.22\times $ $10^{-3}$ GPa$^{-1}$) found from pressure-dependent x-ray diffraction are in good agreement with the ultrasound measurements. Unlike doping on the Rh site where $T_{c}$ increases linearly with the ratio of the tetragonal lattice parameters $c/a,$ no such correlation is observed under pressure; instead, a double peaked structure with a local minimum around 4-5 GPa is observed at both room and low temperatures.