On the electronic structure of electron doped LaOFeAs as seen by X-ray absorption spectroscopy

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dc.creatorKroll, T.
dc.creatorBonhommeau, S.
dc.creatorKachel, T.
dc.creatorDuerr, H. A.
dc.creatorWerner, J.
dc.creatorBehr, G.
dc.creatorKoitzsch, A.
dc.creatorHuebel, R.
dc.creatorLeger, S.
dc.creatorSchoenfelder, R.
dc.creatorAriffin, A.
dc.creatorManzke, R.
dc.creatorde Groot, F. M. F.
dc.creatorFink, J.
dc.creatorEschrig, H.
dc.creatorBuechner, B.
dc.creatorKnupfer, M.
dc.date2008-06-16
dc.date2008-06-19
dc.date.accessioned2026-07-07T12:35:02Z
dc.date.available2026-07-07T12:35:02Z
dc.descriptionWe investigated the recently found superconductor LaO_{1-x}F_xFeAs by X-ray absorption spectroscopy (XAS). From a comparison of the O K-edge with LDA calculations we find good agreement and are able to explain the structure and changes of the spectra with electron doping. An important result from this edge is a limitation of the Hubbard U to values not significantly larger than 1 eV. 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 Delta, and the on-site 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_2,3-edge spectra which emphasizes the importance of band effects in these compounds.
dc.description4 pages, 2 figures
dc.identifierhttps://arxiv.org/abs/0806.2625
dc.identifierhttp://arxiv.org/abs/0806.2625
dc.identifierPhys. Rev. B 78, 220502 (2008)
dc.identifierdoi:10.1103/PhysRevB.78.220502
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/217649
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleOn the electronic structure of electron doped LaOFeAs as seen by X-ray absorption spectroscopy
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