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X-ray absorption spectroscopy measurement on the LaO1-xFxFeAs system | | C. L. Zhang
; A. Ignatov
; M. Vannucci
; M. Croft
; T. A. Tyson
; D. Kwok
; Z. Qin
; S.-W. Cheong
; | | Date: |
15 Aug 2008 | | Abstract: | Results of Fe-K, As-K, and La-L3 edge x-ray absorption spectroscopy (XAS)
measurements on LaO1-xFxFeAs compounds are presented. The Fe-K near edge XAS
results show clear F-substitution induced changes; a chemical shift to lower
energy, near edge feature modifications, and pre-edge feature degradation. The
former two changes provide evidence of doped 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 exhibit spectral structures typical of
compounds with covalently bounded transition-metal/p-block elements as is
illustrated by comparison to other such 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. | | Source: | arXiv, 0808.2134 | | Services: | Forum | Review | PDF | Favorites | |
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