Orbital symmetry of Ba(Fe1−xCox)2As2 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

doi:10.1103/PhysRevB.81.104518

Orbital symmetry of Ba(Fe1−xCox)2As2 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

DOI 10.1103/PhysRevB.81.104518 · Physical Review B

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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 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Ba(Fe1-xCox)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	22	Pressure not reported	unknown
BaFe1.8Co0.2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	22	Pressure not reported	unknown