Orbital symmetry of Ba(Fe1-xCox)2As 2 superconductors probed with x-ray absorption spectroscopy

C. Parks Cheney, F. Bondino, T. A. Callcott, P. Vilmercati, D. Ederer, E. Magnano, M. Malvestuto, F. Parmigiani, A. S. Sefat, M. A. McGuire, R. Jin, B. C. Sales, D. Mandrus, D. J. Singh, J. W. Freeland, N. Mannella

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Abstract

The orbital symmetries of electron-doped iron-arsenide superconductors Ba(Fe1-xCox)2As2 have been measured with x-ray absorption spectroscopy. The data reveal signatures of Fed electron itinerancy, weak electronic correlations, and a high degree of Fe-As hybridization related to the bonding topology of the Fe dxz+yz states, which are found to contribute substantially at the Fermi level. The energies and detailed orbital character of Fe and As derived unoccupied s and d states are found to be in remarkably good agreement with the predictions of standard density-functional theory.

Original languageEnglish
Article number104518
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number10
DOIs
StatePublished - Mar 18 2010

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