Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO_1-xF_x

2008/03/31 by Kazuhiko Kuroki, Seiichiro Onari, Ryotaro Arita +4 · 1 citation
Physics and Astronomy · #cond-mat.supr-con #cond-mat.str-el

paper · pdf · doi:10.1103/physrevlett.101.087004

published as Phys. Rev. Lett. 101, 087004 (2008) · 5 pages, 2 figures, to be published in Phys. Rev. Lett

arxiv created 2008/07/17 · arxiv updated 2009/12/01

Abstract

For a newly discovered iron-based high T_c superconductor LaFeAsO_1-xF_x, we have constructed a minimal model, where inclusion of all the five Fe d bands is found to be necessary. 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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