title: Unconventional pairing originating from the disconnected Fermi surfaces of superconducting LaFeAsO1-xFx.
abstract: For a newly discovered iron-based high T_{c} superconductor LaFeAsO1-xFx, we have constructed a minimal model, where inclusion of all five Fe d bands is found to be necessary. The random-phase approximation is applied to the model to investigate the origin of superconductivity. We conclude that the multiple spin-fluctuation modes arising from the nesting across the disconnected Fermi surfaces realize an extended s-wave pairing, while d-wave pairing can also be another candidate.
authors.affiliation: Department of Applied Physics and Chemistry, The University of Electro -Communications, Chofu, Tokyo 182-8585, Japan.
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Kuroki
authors.forename: Seiichiro
authors.initials: S
authors.lastname: Onari
authors.forename: Ryotaro
authors.initials: R
authors.lastname: Arita
authors.forename: Hidetomo
authors.initials: H
authors.lastname: Usui
authors.forename: Yukio
authors.initials: Y
authors.lastname: Tanaka
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kontani
authors.forename: Hideo
authors.initials: H
authors.lastname: Aoki