Unconventional pairing originating from disconnected Fermi surfaces in the iron-based superconductor

Kazuhiko Kuroki, Seiichiro Onari, Ryotaro Arita, Hidetomo Usui, Yukio Tanaka, Hiroshi Kontani, Hideo Aoki

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

For an iron-based high Tc superconductor LaFeAsO 1-xFx, we construct a minimal model where all of the five Fe d bands turn out to be involved. We then investigate the origin of superconductivity with a five-band random-phase approximation by solving the Eliashberg equation. We conclude that the spin fluctuation modes arising from the nesting between the disconnected Fermi pockets realize basically an extended s-wave pairing, where the gap changes sign across the nesting vector.

Original languageEnglish
Article number025017
JournalNew Journal of Physics
Volume11
DOIs
Publication statusPublished - Feb 27 2009

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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