Abstract
We investigated the recently found superconductor LaFeAsO 1- x F x by X-ray absorption spectroscopy (XAS). A shift in the chemical potential is visible in both the Fe L 2,3 and O K edge spectra which emphasizes the importance of band effects and moderate correlations in these compounds. From experimental Fe L 2,3 edge spectra and charge transfer multiplet calculations we gain further information on important physical values such as hopping parameters, the charge transfer energy Δ, and the on-site Hubbard U . Furthermore we find the system to be very covalent with a large amount of ligand holes.
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