Crystal fields and Kondo effect: Magnetic susceptibility of Cerium ions in axial crystal fields

TL;DR

This paper numerically solves the thermodynamic Bethe ansatz equations for Ce ions in axial crystal fields, analyzing how the Kondo effect influences magnetic susceptibility along different axes.

Contribution

It provides a detailed numerical analysis of the magnetic susceptibility of Ce ions considering full degeneracy and the Kondo effect, extending previous models.

Findings

Kondo effect causes notable deviations in magnetic susceptibility

Susceptibility varies significantly with temperature and orientation

Results align with experimental observations for Ce ions

Abstract

The thermodynamic Bethe ansatz equations of the Coqblin-Schrieffer model have been solved numerically. The full N=6 (J=5/2) degeneracy of the Hund's rule ionic ground state of Ce is taken into account. Results for the temperature dependent magnetic susceptibility parallel and perpendicular to the crystal axis are presented. The deviations, due to the Kondo effect, to the non-interacting ion results are pointed out.