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

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.

12 pages, 3 figures

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• A possible ground state and its electronic structure of a mother material (LaOFeAs) of new superconductors
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Cited by in corpus (3)

• Electronic Structure of Fe-Based Superconductors
• Strength of correlations in pnictides and its assessment by theoretical calculations and spectroscopy experiments
• A high resolution, hard X-ray photoemission investigation of BaFe${}_2$As${}_2$: moderate influence of the surface and evidence for a low degree of Fe 3d - As 4p hybridization of the near-E${}_F$ electronic states