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