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Temperature-dependent local lattice structures of 1111-type ReFeAsO1−xFx (Re=La, Sm) are studied by extended X-ray absorption fine structure (EXAFS) and compared with the results of impurity-doped La1.85Sr0.15CuO4. As electron carriers are introduced by doping with F ions, pnictgen coordination around Fe atom shows unusual local lattice response below T∗, described as an anomalous temperature...
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