Probing the role of co substitution in the electronic structure of iron pnictides

G. Levy*, R. Sutarto, D. Chevrier, T. Regier, R. Blyth, J. Geck, S. Wurmehl, L. Harnagea, H. Wadati, T. Mizokawa, I. S. Elfimov, A. Damascelli, G. A. Sawatzky

*この研究の対応する著者

研究成果: Article査読

45 被引用数 (Scopus)

抄録

The role of Co substitution in the low-energy electronic structure ofCa(Fe 0.944Co 0.056) 2As 2 is investigated by resonant photoemission spectroscopy and density-functional theory. The Co 3d state center of mass is observed at 250 meV higher binding energy than that of Fe, indicating that Co possesses one extra valence electron and that Fe and Co are in the same oxidation state.Yet, significant Co character is detected for the Bloch wave functions at the chemical potential, revealing that the Co 3d electrons are part of the Fermi sea determining the Fermi surface. This establishes the complex role of Co substitution in CaFe 2As 2 and the inadequacy of a rigid-band shift description.

本文言語English
論文番号077001
ジャーナルPhysical Review Letters
109
7
DOI
出版ステータスPublished - 2012 8 13
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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