Elastic anomalies in HoNi2B2C single crystals
arXiv:cond-mat/0406007 · doi:10.1103/PhysRevB.70.220504
Abstract
We have measured temperature and magnetic field dependencies of the sound velocities and the sound attenuation in HoNi2B2C single crystals. The main result is a huge softening the velocity of C66 mode due to a cooperative Jahn-Teller effect, resulting in a tetragonal-orthorhombic structural phase transition. Anomalies in the behavior of the C66 mode through various magnetic phase transitions permit us to revise the low temperature H-T phase diagrams of this compound.
v2: a discussion of the C44 mode with the comparison to Y borocarbide was added