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

doi:10.1103/PhysRevB.78.214513

Low-temperature lattice structure anomaly in the LaFeAsO _0.93F_0.07 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

Research output: Contribution to journal › Article › peer-review

27 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 language	English
Article number	214513
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	78
Issue number	21
DOIs	https://doi.org/10.1103/PhysRevB.78.214513
Publication status	Published - 2008 Dec 1
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.78.214513

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Low-temperature lattice structure anomaly in the LaFeAsO _0.93F_0.07 superconductor by x-ray absorption spectroscopy: Evidence for a strong electron-phonon interaction. / Zhang, C. J.; Oyanagi, H.; Sun, Z. H. et al.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 78, No. 21, 214513, 01.12.2008.

Research output: Contribution to journal › Article › peer-review

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Low-temperature lattice structure anomaly in the LaFeAsO _0.93F_0.07 superconductor by x-ray absorption spectroscopy: Evidence for a strong electron-phonon interaction

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