Co-Substitution Effects on the Fe Valence in the BaFe2As2 Superconducting Compound: A Study of Hard X-Ray Absorption Spectroscopy
E. M. Bittar, C. Adriano, T. M. Garitezi, P. F. S. Rosa, L. Mendonça-Ferreira, F. Garcia, G. de M. Azevedo, P. G. Pagliuso, E. Granado
DOI 10.1103/PhysRevLett.107.267402 · Physical Review Letters
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Abstract
The Fe K x-ray absorption near edge structure 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaFe2-xCoxAs2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38 | Pressure not reported | onset |
| LaFeAsO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| BaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | 5.5 GPa | unknown |
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