Low-temperature lattice anomaly in LaFeAsO0.93F0.07 probed by X-ray absorption spectroscopy: Evidence for strong electron-lattice interaction

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

Research output: Contribution to journalArticle

Abstract

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 (x = 0.07). 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 superconducting transition.

Original languageEnglish
Pages (from-to)S311-S312
JournalPhysica C: Superconductivity and its applications
Volume470
Issue numberSUPPL.1
DOIs
Publication statusPublished - 2010 Dec 1
Externally publishedYes

Keywords

  • LaFeAsOF
  • Lattice anomaly
  • Polaron
  • X-ray absorption spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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