Electronic and lattice structures in SmFeAsO1-x Fx probed by x-ray absorption spectroscopy

C. J. Zhang, H. Oyanagi, Z. H. Sun, Y. Kamihara, H. Hosono

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17 Citations (Scopus)


Local lattice and electronic structures in the Fe-As layer of SmFeAsO 1-x Fx superconductors were studied by x-ray absorption spectroscopy, the FeK -edge and the AsK -edge extended x-ray absorption fine-structure, and x-ray absorption near-edge-structure experiments, respectively. Temperature-dependent local lattice distortions were observed in the Fe-As bond mean-square relative displacement of the superconducting samples. A strong coupling of the carrier-induced local lattice distortion (polaron) to the superconducting transition temperature in the oxypnictide superconductors is indicated. The near-edge spectra showed systematic temperature-dependent energy shifts, which indicate an intralayer electron redistribution from Fed states to Asp states due to orbital-selective band filling at low temperatures.

Original languageEnglish
Article number094516
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number9
Publication statusPublished - 2010 Mar 17
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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