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The local structure of the parent and doped LaFeAsO1-xFx (pnictide) compoundswere studied by x-ray absorption spectroscopy. In the doped system, the Fe-Asand Fe-Fe correlations are well modeled by an Einstein model with no lowtemperature anomalies. For the Fe-As bonds, the Einstein temperatures areidentical for the doped (11%) and undoped samples, but the doped sample isfound to have a lower level of static disorder. For the Fe-Fe correlation,doping enhances the effective Einstein temperature of Fe-Fe atom correlation.The results suggest that the onset of superconductivity in the F doped systemmay be related to enhanced magnetic correlations. Density functionalcalculations of the charge density reveal strong bonding between neighboring Asions but metal-like behavior in the Fe layers.

Temperature Dependent Local Structure of LaFeAsO_{1-x}F_x: Probing the Bond Correlations