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

Research output: Contribution to journal › Research article › Contributed › peer-review

Contributors

  • G. Levy - , University of British Columbia (Author)
  • R. Sutarto - , University of British Columbia, University of Saskatchewan (Author)
  • D. Chevrier - , University of Saskatchewan (Author)
  • T. Regier - , University of Saskatchewan (Author)
  • R. Blyth - , University of Saskatchewan (Author)
  • J. Geck - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • S. Wurmehl - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • L. Harnagea - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • H. Wadati - , The University of Tokyo (Author)
  • T. Mizokawa - , The University of Tokyo (Author)
  • I. S. Elfimov - , University of British Columbia (Author)
  • A. Damascelli - , University of British Columbia (Author)
  • G. A. Sawatzky - , University of British Columbia (Author)

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.

Details

Original languageEnglish
Article number077001
JournalPhysical review letters
Volume109
Issue number7
Publication statusPublished - 13 Aug 2012
Peer-reviewedYes
Externally publishedYes

External IDs

ORCID /0000-0002-2438-0672/work/158767784

Keywords

ASJC Scopus subject areas