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The Fe K X-ray absorption near edge structure (XANES) of BaFe2-xCoxAs2superconductors was investigated. No appreciable alteration in shape or energyposition of this edge was observed with Co substitution. This result providesexperimental support to previous ab initio calculations in which the extra Coelectron is concentrated at the substitute site and do not change theelectronic occupation of the Fe ions. Superconductivity may emerge due tobonding modifications induced by the substitute atom that weakens thespin-density-wave ground state by reducing the Fe local moments and/orincreasing the elastic energy penalty of the accompanying orthorhombicdistortion.

Co-substitution effects on the Fe-valence in the BaFe2As2 superconducting compound: A study of hard x-ray absorption spectroscopy