High energy, high resolution photoelectron spectroscopy of Co2Mn(1-x)Fe(x)Si

TL;DR

This study uses high energy photoelectron spectroscopy to analyze the bulk electronic structure of Co2Mn(1-x)Fe(x)Si alloys, revealing a minority gap near the Fermi level consistent with theoretical calculations.

Contribution

It demonstrates that high energy photoelectron spectroscopy provides a more accurate view of bulk electronic structures compared to low energy XPS, confirming the minority gap in these alloys.

Findings

High energy spectra better reveal bulk electronic structure.

Minority states exhibit a gap near the Fermi energy.

Good agreement with LDA+U calculations.

Abstract

This work reports on high resolution photoelectron spectroscopy for the valence band of Co2Mn(1-x)Fe(x)Si (x=0,0.5,1) excited by photons of about 8 keV energy. The measurements show a good agreement to calculations of the electronic structure using the LDA+U scheme. It is shown that the high energy spectra reveal the bulk electronic structure better compared to low energy XPS spectra. The high resolution measurements of the valence band close to the Fermi energy indicate the existence of the gap in the minority states for all three alloys.