X-ray spectra and electronic structure of FeAs superconductors

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dc.creatorKurmaev, E. Z.
dc.creatorWilks, R. G.
dc.creatorMoewes, A.
dc.creatorSkorikov, N. A.
dc.creatorIzyumov, Yu. A.
dc.creatorFinkelstein, L. D.
dc.creatorLi, R. H.
dc.creatorChen, X. H.
dc.date2008-05-06
dc.date2008-05-19
dc.date.accessioned2026-07-07T12:09:39Z
dc.date.available2026-07-07T12:09:39Z
dc.descriptionThe densities of the valence and conduction band electronic states of the newly discovered layered superconductors LaOFeAs, LaO$_{0.87}$F$_{0.13}$FeAs (Tc=26 K), SmO$_{0.95}$F$_{0.05}$FeAs and SmO$_{0.85}$F$_{0.15}$FeAs (Tc=43 K) are studied using soft X-ray absorption and emission spectroscopy combined with FP LAPW calculations of LaOFeAs, LaO$_{0.875}$FeAs and LaO$_{0.875}$F${0.125}$FeAs. The Fe 3d-states are localized in energy near the top of the valence band and are partially hybridized with p-type O (2p), As (4p), and La (6p) states approximately 3 eV below the Fermi energy. The Fe L3 X-ray emission spectra do not show any features that would indicate the presence of the low Hubbard 3d-band or the quasiparticle peak that were predicted by the DMFT analysis of LaOFeAs. We can conclude that the LaOFeAs-type compounds do not represent strongly correlated systems. When either oxygen vacancies or fluorine dopants are included in numerical electronic structure calculations the width of O 2p-band decreases, but the distribution of Fe 3d-states is largely unaffected.
dc.description5 pages, 7 figures
dc.identifierhttps://arxiv.org/abs/0805.0668
dc.identifierhttp://arxiv.org/abs/0805.0668
dc.identifierPhys. Rev. B 78, 220503(R) (2008)
dc.identifierdoi:10.1103/PhysRevB.78.220503
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/209695
dc.subjectSuperconductivity
dc.titleX-ray spectra and electronic structure of FeAs superconductors
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