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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
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
Yanagi, Yuki
37486
Yamakawa, Youichi
37487
Ono, Yoshiaki
62
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' , an extended s-wave (s±wave) pairing with sign reversal of order parameter is mediated by antiferromagnetic spin fluctuations, while when U<U' 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'.
journal article
American Physical Society
2010-02
application/pdf
Physical review. Third series. B, Condensed matter and materials physics
5
81
054518-1
054518-10
Physical review. Third series. B, Condensed matter and materials physics
AA11187113
10980121
https://niigata-u.repo.nii.ac.jp/record/2500/files/81(5)_054518.pdf
eng
info:doi/10.1103/PhysRevB.81.054518
http://journals.aps.org/prb/pdf/10.1103/PhysRevB.81.054518
Copyright (C) 2010 The American Physical Society