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

Kazuhiko Kuroki; Seiichiro Onari; Ryotaro Arita; Hidetomo Usui; Yukio Tanaka; Hiroshi Kontani; Hideo Aoki

doi:10.1088/1367-2630/11/2/025017

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

Kazuhiko Kuroki, Seiichiro Onari, Ryotaro Arita, Hidetomo Usui, Yukio Tanaka, Hiroshi Kontani, Hideo Aoki

Graduate School of Natural Science and Technology

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

For an iron-based high T_c superconductor LaFeAsO _1-xF_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 realize basically an extended s-wave pairing, where the gap changes sign across the nesting vector.

Original language	English
Article number	025017
Journal	New Journal of Physics
Volume	11
DOIs	https://doi.org/10.1088/1367-2630/11/2/025017
Publication status	Published - Feb 27 2009

ASJC Scopus subject areas

Physics and Astronomy(all)

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abstract = "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.",

author = "Kazuhiko Kuroki and Seiichiro Onari and Ryotaro Arita and Hidetomo Usui and Yukio Tanaka and Hiroshi Kontani and Hideo Aoki",

note = "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. ",

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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.

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