Elastic properties of FeSi

TL;DR

This study measures the elastic properties of FeSi across a broad temperature range, revealing deviations from expected behavior and indicating electronic structure changes.

Contribution

It provides new experimental data on FeSi's elastic constants and identifies anomalous temperature-dependent behavior.

Findings

Elastic constants deviate from quasiharmonic behavior at high temperatures

C12 increases anomalously over the entire temperature range

Evidence suggests a change in the electron structure of FeSi

Abstract

Measurements of the sound velocities in a single crystal of FeSi were performed in the temperature range 4-300 K. Elastic constants $C_{12}$ and $C_{44}$ deviate from a quasiharmonic behavior at high temperature; whereas, $C_{12}$ increases anomalously in the entire range of temperature, indicating a change in the electron structure of this material