NMR investigation of the Knight shift anomaly in CeIrIn5 at high magnetic fields

TL;DR

This study uses NMR to examine the Knight shift anomaly in CeIrIn5 under high magnetic fields, revealing that the heavy electron effective mass and coherence temperature are largely unaffected by strong magnetic fields, despite Zeeman energy considerations.

Contribution

It provides new insights into the magnetic field effects on heavy fermion behavior in CeIrIn5 through detailed NMR analysis.

Findings

Knight shift anomaly observed at high fields

Kondo lattice coherence temperature remains stable

Heavy electron effective mass is unaffected by magnetic field

Abstract

We report nuclear magnetic resonance Knight shift data in the heavy fermion material CeIrIn5 at fields up to 30 T. The Knight shift of the In displays a strong anomaly, and we analyze the results using two different interpretations. We find that the Kondo lattice coherence temperature and the effective mass of the heavy electrons remains largely unaffected by the magnetic field, despite the fact that the Zeeman energy is on the order of the coherence temperature.