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

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1 Citation (Scopus)

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 (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.

Original languageEnglish
Article number012094
JournalJournal of Physics: Conference Series
Volume190
DOIs
Publication statusPublished - 2009 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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