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Two types of s-wave pairing due to magnetic and orbital fluctuations in the two-dimensional 16-band d-p model for iron-based superconductors

Source: Phys. Rev. B 81, 054518 (2010); doi:10.1103/PhysRevB.81.054518

Published 23 February 2010

PACS
  • 74.20.Rp
    Pairing symmetries (other than s-wave) in superconductivity theory
  • 74.25.Dw
    Superconductivity phase diagrams
  • 74.70.Xa
    Pnictides and chalcogenides
  • 74.20.Mn
    Nonconventional mechanisms of superconductivity
  • YEAR: 2010
PUBLICATION DATA
Publisher:
AIP is a member of CrossRef APS
Yuki Yanagi and Youichi Yamakawa
Department of Physics, Niigata University, Ikarashi, Niigata 950-2181, Japan

Yoshiaki Ono
Department of Physics, Niigata University, Ikarashi, Niigata 950-2181, Japan and Center for Transdisciplinary Research, Niigata University, Ikarashi, Niigata 950-2181, Japan
We study superconductivity in the two-dimensional 16-band d-p model extracted from a tight-binding fit to the band structure of LaFeAsO, using the random phase approximation. When the intraorbital repulsion U is larger than the interorbital one U[prime], an extended s-wave (s±-wave) pairing with sign reversal of order parameter is mediated by antiferromagnetic spin fluctuations, while when U<U[prime] another kind of s-wave (s++-wave) pairing without sign reversal is mediated by ferro-orbital fluctuations. The s++-wave pairing is enhanced due to the electron-phonon coupling and then can be expanded over the realistic parameter region with U>U[prime]. ©2010 The American Physical Society
History: Received 11 December 2009; revised 29 January 2010; published 23 February 2010
Permalink: http://link.aps.org/abstract/PRB/v81/e054518
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