Theory on the Stability of the Ferromagnetic Double Layer Structure and on the Peak Structure of the Magneto-Optical Spectra of CeSb

TL;DR

This paper introduces a pf+pd mixing model for CeSb that explains the stability of its ferromagnetic double layer structure and the peak features in its magneto-optical spectra, aligning theory with experimental observations.

Contribution

The paper presents a novel pf+pd mixing model that accounts for the stability of CeSb's ferromagnetic double layer and its magneto-optical spectral peaks, which was not previously understood.

Findings

The pf+pd mixing model explains the stability of the ferromagnetic double layer.

The model accounts for the peak structures in magneto-optical spectra.

Saddle type singular points are identified as key features in the electronic structure.

Abstract

We propose the pf+pd mixing model for CeSb to explain the stability of the ferromagnetic double layer structure in the magnetic ordering. The pd mixing causes the saddle type singular points, neighboring the $\Delta$ axis, for the bands which gain energy through the pf hybridization with the occupied f state. The peak of the density of states due to this combined effect of the pf mixing and the pd mixing enhances the stability of the double layer structure. The same combined effect also causes the saddle type singular points in the joint density of states of the optical transition. The peak structure of the magneto-optical spectra which has been observed in experiments is explained by the present model.