Physics – Condensed Matter – Superconductivity
Scientific paper
2008-08-15
Physics
Condensed Matter
Superconductivity
Scientific paper
Results 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.
Cheong Sang-Wook
Croft Mark
Ignatov Anatoly A.
Kwok D.
Qin Zhen
No associations
LandOfFree
X-ray absorption spectroscopy measurement on the LaO1-xFxFeAs system does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with X-ray absorption spectroscopy measurement on the LaO1-xFxFeAs system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and X-ray absorption spectroscopy measurement on the LaO1-xFxFeAs system will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-651164