Non-Fermi Liquid behavior in CeIrIn$_5$ near a metamagnetic transition

TL;DR

This study investigates the non-Fermi-liquid behavior in CeIrIn5 near a metamagnetic transition, revealing anisotropic responses to magnetic fields and suggesting a quantum critical point as the underlying cause.

Contribution

It provides experimental evidence linking NFL behavior in CeIrIn5 to a nearby metamagnetic quantum critical point, with detailed anisotropic field dependence analysis.

Findings

NFL behavior develops above 12 T for H || [001]

Fermi liquid state is more robust for H  [001]

NFL behavior likely caused by proximity to a metamagnetic quantum critical point

Abstract

We present specific heat and resistivity study of CeIrIn5 in magnetic fields up to 17 T and temperature down to 50 mK. Both quantities were measured with the magnetic field parallel to the c-axis (H || [001]) and within the a-b plane (H \perp [001]). Non-Fermi-liquid (NFL) behavior develops above 12 T for H || [001]. The Fermi liquid state is much more robust for H \perp [001] and is suppressed only moderately at the highest applied field. Based on the observed trends and the proximity to a metamagnetic phase transition, which exists at fields above 25 T for H || [001], we suggest that the observed NFL behavior in CeIrIn5 is a consequence of a metamagnetic quantum critical point.