Electronic structure of LaFeAsO1-xFx from x-ray absorption spectroscopy
Kroll, T.; Bonhommeau, S.; Kachel, T.; Duerr, H. A.; Werner, J.; Behr, G.; Koitzsch, A.; Huebel, R.; Leger, S.; Schoenfelder, R.; Ariffin, A. K.; Manzke, R.; de Groot, F. M. F.; Fink, J.; Eschrig, H.; Buechner, B.; Knupfer, M.
(2008) Physical review. B, Condensed matter and materials physics, volume 78, issue 22
(Article)
Abstract
We investigated the recently found superconductor LaFeAsO1-xFx by x-ray absorption spectroscopy. From a comparison of the O K edge with LDA calculations we find good agreement and are able to explain the structure and changes in the spectra with electron doping. From experimental Fe L-2,L-3-edge spectra and charge-transfer multiplet calculations
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we gain further information on important physical values such as the hopping parameters, the charge-transfer energy Delta, and the Hubbard U. Furthermore we find the system to be very covalent with a large amount of ligand holes. A shift in the chemical potential is visible in the O K- and Fe L-2,L-3-edge spectra which emphasizes the importance of band effects in these compounds. From the entirety of our results we conclude that LaFeAsO is a bandwidth-dominated material.
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Keywords: charge exchange, chemical potential, Fermi level, high-temperature superconductors, Hubbard model, iron compounds, lanthanum compounds, superconducting materials, X-ray absorption spectra, LAYERED SUPERCONDUCTOR LAO0.9F0.1-DELTA-FEAS, 43 K, COMPOUND, GAP
ISSN: 1098-0121
Publisher: American Physical Society
(Peer reviewed)
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