Indexed by: Journal paper

First Author: T. Qian

Correspondence Author: H. Ding

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

Journal: Physical Review B

Included Journals: SCI

Discipline: 物理学

Document Type: J

Volume: 83

Issue: 14

Page Number: 140513

ISSN No.: 2469-9950

Date of Publication: 2011-04-29

Impact Factor: 3.691

Abstract: We have performed an angle-resolved photoemission spectroscopy study of the iron-based superconductor (SC) Sr 2 VFeAsO 3. While V 3 d orbitals are found to be in a Mott-insulating state and show an incoherent peak at~ 1 eV below the Fermi level, the dispersive Fe 3 d 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 3 d electrons can reproduce the experimental observation reasonably well. The observed fermiology in SC Sr 2 VFeAsO 3 strongly supports that (π, 0) interband scattering between quasinested FSs may play an important role for SC in pnictides.

Links to published journals: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.83.140513