Field-Induced Lifshitz Transition without Metamagnetism in CeIrIn$_5$

TL;DR

This study investigates the electronic structure changes in CeIrIn$_5$ under high magnetic fields, revealing a Lifshitz transition without accompanying metamagnetism, challenging previous assumptions about its magnetic behavior.

Contribution

It provides evidence for a field-induced Lifshitz transition in CeIrIn$_5$ occurring without metamagnetic transition, using multiple experimental techniques.

Findings

Emergence of a new low dHvA frequency with enhanced effective mass above 28 T

Disappearance of the highest low-field dHvA frequency

No magnetization anomaly up to 33 T

Abstract

We report high magnetic field measurements of magnetic torque, thermoelectric power (TEP), magnetization, and de Haas-van Alphen (dHvA) effect in CeIrIn$_5$ across 28 T, where a metamagnetic transition was suggested in previous studies. The TEP displays two maxima at 28 T and 32 T. Above 28 T, a new, low dHvA frequency with strongly enhanced effective mass emerges, while the highest frequency observed at low field disappears entirely. This suggests a field-induced Lifshitz transition. However, longitudinal magnetization does not show any anomaly up to 33 T, thus ruling out a metamagnetic transition at 28 T.