Journal
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
Volume 469, Issue 9-12, Pages 635-639Publisher
ELSEVIER
DOI: 10.1016/j.physc.2009.03.021
Keywords
Iron pnictide superconductors; Disconnected Fermi surface; Spin fluctuation mediated pairing
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Funding
- MEXT of Japan
- Japan Society for the Promotion of Science
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For the iron-based high T-c superconductor LaFeAsO1-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 realise, basically, an extended s-wave pairing, where the gap changes sign across the nesting vector. (C) 2009 Elsevier B.V. All rights reserved.
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