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

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


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
Publication statusPublished - 2009
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


Dive into the research topics of 'Local lattice response in LaFeAsO<sub>0.93</sub>F<sub>0.07</sub> probed by x-ray absorption spectroscopy: Evidence for carrier-induced lattice distortion'. Together they form a unique fingerprint.

Cite this