H Oyanagi et al 2009 J. Phys.: Conf. Ser. 190 012094 doi:10.1088/1742-6596/190/1/012094
H Oyanagi1, C J Zhang1, Z H Sun1, Y Kamihara2 and H Hosono2
Show affiliationsCarrier-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), 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.
78.70.Dm X-ray absorption spectra
74.62.Dh Effects of crystal defects, doping and substitution
61.05.cj X-ray absorption spectroscopy: EXAFS, NEXAFS, XANES, etc.
74.62.Bf Effects of material synthesis, crystal structure, and chemical composition
Issue 1 (2009)
H Oyanagi et al 2009 J. Phys.: Conf. Ser. 190 012094
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