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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

2010; American Physical Society; Volume: 81; Issue: 5 Linguagem: Inglês

10.1103/physrevb.81.054518

1550-235X

Yuki Yanagi, Youichi Yamakawa, Yoshiaki Ōno,

Physics of Superconductivity and Magnetism

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'.