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, Yoichi Kamihara, H. Hosono

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

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
Volume78
Issue number21
DOIs
Publication statusPublished - 2008 Dec 1
Externally publishedYes

Fingerprint

Electron-phonon interactions
electron phonon interactions
Absorption spectroscopy
x ray absorption
x ray spectroscopy
Superconducting materials
absorption spectroscopy
anomalies
X rays
Electrons
Electron transitions
Superconducting transition temperature
Temperature
cuprates
electrons
fine structure
transition temperature
occurrences
interactions

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

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abstract = "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.",
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AU - Sun, Z. H.

AU - Kamihara, Yoichi

AU - Hosono, H.

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AB - 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.

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