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

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Abstract

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.

Original languageEnglish
Article number077001
JournalPhysical Review Letters
Volume109
Issue number7
DOIs
Publication statusPublished - 2012 Aug 13
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Levy, G., Sutarto, R., Chevrier, D., Regier, T., Blyth, R., Geck, J., Wurmehl, S., Harnagea, L., Wadati, H., Mizokawa, T., Elfimov, I. S., Damascelli, A., & Sawatzky, G. A. (2012). Probing the role of co substitution in the electronic structure of iron pnictides. Physical Review Letters, 109(7), [077001]. https://doi.org/10.1103/PhysRevLett.109.077001