Elastic anomalies in HoNi2B2C single crystals
V.D. Fil, A. Knigavko, A.N. Zholobenko, E.-M.Choi, S.-I. Lee
TL;DR
This study investigates elastic properties of HoNi2B2C single crystals, revealing a significant softening of sound velocity linked to a Jahn-Teller effect and structural phase transitions, refining the magnetic phase diagram.
Contribution
It provides new insights into the elastic anomalies and phase transitions in HoNi2B2C, highlighting the role of Jahn-Teller effects in structural changes.
Findings
Huge softening of C66 mode velocity due to Jahn-Teller effect
Identification of a tetragonal-orthorhombic phase transition
Revised low-temperature H-T phase diagrams
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.
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