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Temperature-dependent local structure of LaFeAsO1−xFx: Probing the atomic correlations
Journal of Applied Physics
The local structure of the parent and doped LaFeAsO 1−x F x ͑pnictide͒ compounds were studied by x-ray absorption spectroscopy and density functional methods. In the doped system, the Fe-As and Fe-Fe correlations are both well modeled by an Einstein model. For the Fe-As bonds, the Einstein temperatures are identical for the doped ͑11%͒ and undoped samples but the doped sample is found to have a lower level of static disorder. Doping is found to increases the effective Einstein temperature ofdoi:10.1063/1.3525999 fatcat:fnwkpge5wbea7httjfxrhi742y