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

Yuki Yanagi, Youichi Yamakawa, Yoshiaki Ono

Research output: Contribution to journalArticlepeer-review

109 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number054518
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number5
DOIs
Publication statusPublished - 2010 Feb 23
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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