Low-temperature lattice structure anomaly in the LaFeAsO 0.93F0.07 superconductor by x-ray absorption spectroscopy: Evidence for a strong electron-phonon interaction

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

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The local lattice structure in LaFeAsO1-x Fx superconductors is studied by extended x-ray absorption fine-structure measurements. An anomalous upturn of the mean-square relative displacement of the Fe-As bond is detected below ∼70 K as electron carriers are introduced, reflecting the occurrence of Fe-As bond local lattice fluctuation. Similar to that in cuprates, this lattice fluctuation exhibits an abrupt depression at the onset superconducting transition temperature. The results indicate that strong electron-lattice interaction is involved in the superconducting transition in oxypcnictide superconductors, putting a strict limitation on possible theoretical models.

Original languageEnglish
Article number214513
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number21
Publication statusPublished - 2008 Dec 1
Externally publishedYes


ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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