Orbital Symmetry of Ba(Fe1-xCox)2As2 Superconductors Probed with X-ray Absorption Spectroscopy
Cheney, C. Parks · Bondino, F. · Callcott, T. A. · Vilmercati, P. · Ederer, D. · Magnano, E. · Malvestuto, M. · Parmigiani, F. · Sefat, A. S. · McGuire, M. A. · Jin, R. · Sales, B. C. · Mandrus, D. · Singh, D. J. · Freeland, J. W. · Mannella, N.
الأصل · EN
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 Fe d 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.
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