Low-temperature lattice anomaly in LaFeAsO0.93F0.07 probed by X-ray absorption spectroscopy: Evidence for strong electron-lattice interaction

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

doi:10.1016/j.physc.2009.11.161

Low-temperature lattice anomaly in LaFeAsO_0.93F_0.07 probed by X-ray absorption spectroscopy: Evidence for strong electron-lattice interaction

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

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

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 LaFeAsO_1-xF_x (x = 0.07). 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 superconducting transition.

Original language	English
Pages (from-to)	S311-S312
Journal	Physica C: Superconductivity and its applications
Volume	470
Issue number	SUPPL.1
DOIs	https://doi.org/10.1016/j.physc.2009.11.161
Publication status	Published - 2010 Dec
Externally published	Yes

Keywords

LaFeAsOF
Lattice anomaly
Polaron
X-ray absorption spectroscopy

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

Access to Document

10.1016/j.physc.2009.11.161

Cite this

@article{017b5e72677842a0a338650629b31adc,

title = "Low-temperature lattice anomaly in LaFeAsO0.93F0.07 probed by X-ray absorption spectroscopy: Evidence for strong electron-lattice interaction",

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 (x = 0.07). 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 superconducting transition.",

keywords = "LaFeAsOF, Lattice anomaly, Polaron, X-ray absorption spectroscopy",

author = "H. Oyanagi and Zhang, {C. J.} and Sun, {Z. H.} and Y. Kamihara and H. Hosono",

year = "2010",

month = dec,

doi = "10.1016/j.physc.2009.11.161",

language = "English",

volume = "470",

pages = "S311--S312",

journal = "Physica C: Superconductivity and its Applications",

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TY - JOUR

T1 - Low-temperature lattice anomaly in LaFeAsO0.93F0.07 probed by X-ray absorption spectroscopy

T2 - Evidence for strong electron-lattice interaction

AU - Oyanagi, H.

AU - Zhang, C. J.

AU - Sun, Z. H.

AU - Kamihara, Y.

AU - Hosono, H.

PY - 2010/12

Y1 - 2010/12

N2 - 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 (x = 0.07). 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 superconducting transition.

AB - 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 (x = 0.07). 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 superconducting transition.

KW - LaFeAsOF

KW - Lattice anomaly

KW - Polaron

KW - X-ray absorption spectroscopy

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