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.
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