Evolution of the heavy fermion state in Ce2IrIn8

TL;DR

This study investigates the evolution of the heavy fermion state in Ce2IrIn8 using muon spin rotation and susceptibility measurements, revealing a temperature-dependent scaling law and anisotropic characteristic temperatures T*.

Contribution

It introduces a detailed analysis of the Knight-shift anomaly and scaling behavior in Ce2IrIn8, highlighting the anisotropic nature of the heavy-electron state development.

Findings

Identification of a Knight-shift anomaly below T*

Scaling law linking susceptibility components

Anisotropic characteristic temperatures T* along different axes

Abstract

We report muon spin rotation Knight shift and susceptibility studies for 1 T applied field along the crystalline c- and a-axes of the heavy fermion compound Ce2IrIn8. Below a characteristic temperature T* one observes a `Knight-shift anomaly' in which the Knight shift constant K no longer scales linearly with susceptibility chi. This anomaly is consistent with a scaling law in which chi is composed of a high-temperature component corresponding to non-interacting local moments and a low-temperature component chi_cf proportional to (1-T/T*)\ln(T*/T) which characterizes the heavy-electron state below T*. We find that T* is anisotropic, with T_a* = 59(3)K and T_c* = 24(1)K, and derive the magnitudes of chi_cf for H along the a- and c-axes.