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Title: Orbital selective pairing and gap structures of iron-based superconductors

We discuss the in uence on spin-fluctuation pairing theory of orbital selective strong correlation effects in Fe-based superconductors, particularly Fe chalcogenide systems. We propose that a key ingredient for an improved itinerant pairing theory is orbital selectivity, i.e., incorporating the reduced coherence of quasiparticles occupying specific orbital states. This modifies the usual spin-fluctuation via suppression of pair scattering processes involving those less coherent states and results in orbital selective Cooper pairing of electrons in the remaining states. We show that this paradigm yields remarkably good agreement with the experimentally observed anisotropic gap structures in both bulk and monolayer FeSe, as well as LiFeAs, indicating that orbital selective Cooper pairing plays a key role in the more strongly correlated iron-based superconductors.
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [3] ;  [4]
  1. Univ. of Copenhagen (Denmark). The Niels Bohr Inst.; Univ. Leipzig (Germany)
  2. Univ. of Copenhagen (Denmark). The Niels Bohr Inst.
  3. Cornell Univ., Ithaca, NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Univ. of Florida, Gainesville, FL (United States)
Publication Date:
Report Number(s):
BNL-114709-2017-JA
Journal ID: ISSN 2469-9950; PRBMDO; R&D Project: PM015; KC0207010; TRN: US1800340
Grant/Contract Number:
SC0012704; FG02-05ER46236; 2009-BNL-PM015
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 17; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1412747
Alternate Identifier(s):
OSTI ID: 1355955