Unconventional pairing originating from the disconnected Fermi surfaces of superconducting LaFeAsO1-xFx.
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.
Kuroki
Kazuhiko
K
Department of Applied Physics and Chemistry, The University of Electro -Communications, Chofu, Tokyo 182-8585, Japan.
Onari
Seiichiro
S
Arita
Ryotaro
R
Usui
Hidetomo
H
Tanaka
Yukio
Y
Kontani
Hiroshi
H
Aoki
Hideo
H