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

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Authors
Koitzsch, A.
Inosov, D.
Fink, J.
Knupfer, M.
Eschrig, H.
Borisenko, S. V.
Behr, G.
Köhler, A.
Werner, J.
Büchner, B.
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Abstract
Description
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.
Comment: 12 pages, 3 figures
Keywords
Condensed Matter - Superconductivity
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