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Title: Is BaCr 2 As 2 symmetrical to BaFe 2 As 2 with respect to half 3 d shell filling?

We have performed an angle-resolved photoemission spectroscopy study of BaCr 2As 2, which has the same crystal structure as BaFe2As2, a parent compound BaFe 2As 2 of Fe-based superconductors. We determine the Fermi surface of this material and its band dispersion down to 5 eV below the Fermi level. Very moderate band renormalization (1.35) is observed for only two bands. We attribute this small renormalization to enhanced direct exchange as compared to Fe in BaFe 2As 2, and to a larger contribution of the eg orbitals in the composition of the bands forming the Fermi surface.
Authors:
 [1] ;  [2] ;  [3] ;  [1] ;  [4] ;  [4] ;  [1] ;  [5] ;  [6] ;  [1]
  1. Chinese Academy of Sciences (CAS), Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)
  2. Alternative Energies and Atomic Energy Commission (CEA), Grenoble (France)
  3. Chinese Academy of Sciences (CAS), Beijing (China)
  4. Science and Technology Facilities Council (STFC), Harwell Campus, Oxford (United Kingdom). Diamond Light Source, Ltd.
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. European Theoretical Synchrotron Facility
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 18; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1376518
Alternate Identifier(s):
OSTI ID: 1358644