Electronic structures of Cr$_{1-\delta}$X (X=S, Te) studied by Cr 2p soft x-ray magnetic circular dichroism

TL;DR

This study investigates the electronic and magnetic structures of Cr$_{1- extdelta}$Te and Cr$_{5}$S$_{6}$ using Cr 2p soft X-ray magnetic circular dichroism, revealing how hole doping affects their electronic states and magnetic moments.

Contribution

It provides a detailed analysis combining experimental XMCD spectra with cluster model calculations to understand the electronic states and hole distribution in these compounds.

Findings

XMCD lineshapes are weakly dependent on $ extdelta$ in Cr$_{1- extdelta}$Te.

Holes mainly reside in Te 5p orbitals in Cr$_{1- extdelta}$Te.

Holes are likely in Cr 3d states in Cr$_{5}$S$_{6}$.

Abstract

Cr 2p core excited XAS and XMCD spectra of ferromagnetic Cr$_{1-\delta}$Te with several concentrations of $\delta$=0.11-0.33 and ferrimagnetic Cr$_{5}$S$_{6}$ have been measured. The observed XMCD lineshapes are found to very weakly depend on $\delta$ for Cr$_{1-\delta}$Te. The experimental results are analyzed by means of a configuration-interaction cluster model calculation with consideration of hybridization and electron correlation effects. The obtained values of the spin magnetic moment by the cluster model analyses are in agreement with the results of the band structure calculation.The calculated result shows that the doped holes created by the Cr deficiency exist mainly in the Te 5porbital of Cr$_{1-\delta}$Te, whereas the holes are likely to be in Cr 3d state for Cr$_{5}$S$_{6}$.