Valence band and core level photoemission spectros-copy of LaFeAsO$_{1-x}$F$_{x}$

TL;DR

This study combines photoemission spectroscopy and band structure calculations to analyze the electronic structure of LaFeAsO$_{1-x}$F$_{x}$, confirming the dominant Fe 3d character near the Fermi level.

Contribution

It provides experimental evidence supporting the theoretical prediction of strong Fe 3d state contributions in LaFeAsO$_{1-x}$F$_{x}$.

Findings

Valence band features are consistent with LDA calculations.

Fe 3d states dominate near the Fermi level.

Experimental data confirms theoretical predictions.

Abstract

We have investigated the electronic structure of LaFeAsO$_{1-x}$F$_{x}$ (x = 0; 0.1; 0.2) by angle-integrated photoemission spectroscopy and local density approximation (LDA) based band structure calculations. The valence band consists of a low energy peak at E = -0.25 eV and a broad structure around E = -5 eV in qualitative agreement with LDA. From the photon energy dependence of these peaks we conclude that the former derives almost exclusively from Fe 3d states. This constitutes experimental evidence for the strong iron character of the relevant states in a broad window around EF and confirms theoretical predictions.