Quasinested Fe orbitals versus Mott-insulating v orbitals in superconducting Sr2VFeAsO3 as seen from angle-resolved photoemission

T. Qian, N. Xu, Y. B. Shi, K. Nakayama, P. Richard, T. Kawahara, T. Sato, T. Takahashi, M. Neupane, Y. M. Xu, X. P. Wang, G. Xu, X. Dai, Z. Fang, P. Cheng, H. H. Wen, H. Ding

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21 Citations (Scopus)

Abstract

We have performed an angle-resolved photoemission spectroscopy study of the iron-based superconductor (SC) Sr2VFeAsO3. While V 3d orbitals are found to be in a Mott-insulating state and show an incoherent peak at ∼1eV below the Fermi level, the dispersive Fe 3d bands form several hole- and electronlike Fermi surfaces (FSs), some of which are quasinested by the (π,0) wave vector. This differs from the local-density approximation (LDA) calculations, which predict non-nested FSs for this material. However, LDA + U with a large effective Hubbard energy U on V 3d electrons can reproduce the experimental observation reasonably well. The observed fermiology in SC Sr 2VFeAsO3 strongly supports that (π,0) interband scattering between quasinested FSs may play an important role for SC in pnictides.

Original languageEnglish
Article number140513
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number14
DOIs
Publication statusPublished - 2011 Apr 29

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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