期刊
PHYSICAL REVIEW B
卷 81, 期 10, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.104518
关键词
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资金
- NSF [DMR-0804902]
- U. S. Department of Energy [DE-AC05-00OR22725, DE-AC02-06CH11357]
- Eugene P. Wigner Fellowship at ORNL
The orbital symmetries of electron-doped iron-arsenide superconductors Ba(Fe1-xCox)(2)As-2 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 d(xz+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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