High-Field Ultrasonic Study of CeIrIn$_5$

TL;DR

This study used ultrasonic and temperature measurements under pulsed magnetic fields to explore electronic ordering and phase transitions in CeIrIn$_5$, revealing the absence of crystal symmetry breaking at high magnetic fields.

Contribution

It provides new insights into the nature of metamagnetic and Lifshitz transitions in CeIrIn$_5$, showing they are not associated with anisotropic electronic ordering or crystal symmetry breaking.

Findings

Elastic anomalies observed around Lifshitz and metamagnetic transitions.

Elastic anomalies appeared in specific elastic constants indicating electronic effects.

No evidence of crystal symmetry breaking in high magnetic fields for CeIrIn$_5$.

Abstract

We performed ultrasonic and temperature measurements under pulsed magnetic fields on CeIrIn$_5$ to investigate whether or not the origin of metamagnetic transition and field-induced Lifshitz transition was described by the anisotropic electronic ordering with crystal symmetry breaking. We observed elastic anomalies with the negative magnetocaloric effects around the field-induced Lifshitz transition and the metamagnetic transition. On the other hand, the elastic anomalies appeared both in the transverse elastic constants $(C_{11} - C_{12})/2$ and $C_{66}$ in CeIrIn$_5$ while $(C_{11} - C_{12})/2$ showed significant elastic anomaly at the crystal symmetry breaking fields in CeRhIn$_5$. These results indicate that the anisotropic electronic ordering with crystal symmetry breaking is absent in high-magnetic fields in CeIrIn$_{5}$.