TY - JOUR
T1 - Unconventional pairing originating from disconnected Fermi surfaces in the iron-based superconductor
AU - Kuroki, Kazuhiko
AU - Onari, Seiichiro
AU - Arita, Ryotaro
AU - Usui, Hidetomo
AU - Tanaka, Yukio
AU - Kontani, Hiroshi
AU - Aoki, Hideo
N1 - Funding Information:
We wish to thank Ryotaro Arita, Seiichiro Onari, Hidetomo Usui, Yukio Tanaka, and Hiroshi Kontani for a collaboration in Ref. [3] and for valuable discussions. Numerical calculations were performed at the Information Technology Center, University of Tokyo, and at the Supercomputer Center, ISSP, University of Tokyo. This study has been supported by Grants-in-Aid for Scientific Research from MEXT of Japan and from the Japan Society for the Promotion of Science.
PY - 2009/2/27
Y1 - 2009/2/27
N2 - For an iron-based high Tc superconductor LaFeAsO 1-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 realize basically an extended s-wave pairing, where the gap changes sign across the nesting vector.
AB - For an iron-based high Tc superconductor LaFeAsO 1-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 realize basically an extended s-wave pairing, where the gap changes sign across the nesting vector.
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U2 - 10.1088/1367-2630/11/2/025017
DO - 10.1088/1367-2630/11/2/025017
M3 - Article
AN - SCOPUS:63449127204
VL - 11
JO - New Journal of Physics
JF - New Journal of Physics
SN - 1367-2630
M1 - 025017
ER -