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

Abstract

The Fe K X-ray absorption near edge structure (XANES) of BaFe2-xCoxAs2 superconductors was investigated. No appreciable alteration in shape or energy position of this edge was observed with Co substitution. This result provides experimental support to previous ab initio calculations in which the extra Co electron is concentrated at the substitute site and do not change the electronic occupation of the Fe ions. Superconductivity may emerge due to bonding modifications induced by the substitute atom that weakens the spin-density-wave ground state by reducing the Fe local moments and/or increasing the elastic energy penalty of the accompanying orthorhombic distortion.

4+ pages, 4 figures. Published in Phys. Rev. Lett

References in corpus (16)

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• Superconductivity at 22 K in Co-doped BaFe2As2 Crystals
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• Effects of cobalt doping and three-dimensionality in $BaF{e}_{2}A{s}_2$
• Pressure and chemical substitution effects in the local atomic structure of BaFe2As2
• Distinct high-T transitions in underdoped Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$

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