X-ray absorption spectroscopy measurement on the LaO1-xFxFeAs system

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dc.creatorIgnatov, A.
dc.creatorZhang, C. L.
dc.creatorVannucci, M.
dc.creatorCroft, M.
dc.creatorTyson, T. A.
dc.creatorKwok, D.
dc.creatorQin, Z.
dc.creatorCheong, S. -W.
dc.date2008-08-15
dc.date2008-11-11
dc.date.accessioned2026-07-07T10:17:00Z
dc.date.available2026-07-07T10:17:00Z
dc.descriptionResults of Fe K-, As K-, and La L3-edge x-ray absorption near edge structure (XANES) measurements on LaO1-xFxFeAs compounds are presented. The Fe K- edge exhibits a chemical shift to lower energy, near edge feature modifications, and pre-edge feature suppression as a result of F substitution for O. The former two changes provide evidence of electron charge transfer to the Fe sites and the latter directly supports the delivery of this charge into the Fe-3d orbitals. The As K- edge measurements show spectral structures typical of compounds with planes of transition-metal tetrahedrally coordinated to p-block elements as is illustrated by comparison to other such materials. The insensitivity of the As-K edge to doping, along with the strong Fe-K doping response, is consistent with band structure calculations showing essentially pure Fe-d character near the Fermi energy in these materials. The energy of the continuum resonance feature above the La-L3 edge is shown to be quantitatively consistent with the reported La-O inter-atomic separation and with other oxide compounds containing rare earth elements.
dc.identifierhttps://arxiv.org/abs/0808.2134
dc.identifierhttp://arxiv.org/abs/0808.2134
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/173705
dc.subjectSuperconductivity
dc.titleX-ray absorption spectroscopy measurement on the LaO1-xFxFeAs system
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