Local lattice response in LaFeAsO0.93F0.07 probed by x-ray absorption spectroscopy: Evidence for carrier-induced lattice distortion

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

研究成果: Article査読

1 被引用数 (Scopus)

抄録

Carrier-induced lattice distortion (signature of strong electron-lattice interaction) in oxypnictide superconductors is found by a local structural study using extended x-ray absorption fine structure (EXAFS). Local lattice instability (polaron formation) is detected as an anomalous upturn of the mean-square relative displacement for the nearest neighbor distances (Fe-As) in LaFeAsO1-xFx (x0.07), implying a local lattice distortion that develops below 70 K and disappears at the superconducting critical temperature. Comparing the results with the lattice response in cuprate superconductors, intimate correlation between local lattice mode and superconductivity is revealed. The results suggest that strong electron-lattice interaction is present as a common ingredient in the microscopic mechanism of s uperconducting transition.

本文言語English
論文番号012094
ジャーナルJournal of Physics: Conference Series
190
DOI
出版ステータスPublished - 2009
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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