The structure of the quasi two dimensional heavy fermion antiferromagnet CeRhIn5 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≈78 GPa) and uniaxial compressibilities (κa=3.96×10−3 GPa−1 and =4.22×10−3 GPa−1) found from pressure-dependent x-ray diffraction are in good agreement with the ultrasound measurements. Unlike doping on the Rh site where Tc 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.
@article{arxiv.cond-mat/0209005,
title = {Anisotropic Elastic Properties of CeRhIn$_{5}$},
author = {Ravhi S. Kumar and H. Kohlmann and B. E. Light and A. L. Cornelius and V. Raghavan and T. W. Darling and J. L. Sarrao},
journal= {arXiv preprint arXiv:cond-mat/0209005},
year = {2007}
}
Comments
6 pages, 6 figures, accepted for publication in PRB (edited text and figures)