Unconventional pairing originating from disconnected Fermi surfaces in the iron-based superconductor

作者：Kuroki Kazuhiko^*; Aoki Hideo

来源：Physica C-Superconductivity and Its Applications, 2009, 469(9-12): 635-639.

DOI：10.1016/j.physc.2009.03.021

• Iron pnictide superconductors
• Disconnected Fermi surface
• Spin fluctuation mediated pairing

For the iron-based high T(c) superconductor LaFeAsO(1-x)F(x), 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.

• 出版日期2009-6