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J. Phys. Soc. Jpn. 78 (2009) 113707 (4 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Is Fermi-Surface Nesting the Origin of Superconductivity in Iron Pnictides?: A Fluctuation–Exchange-Approximation Study

Ryotaro Arita1,2,3 and Hiroaki Ikeda4

1Department of Applied Physics, University of Tokyo, Bunkyo, Tokyo 113-8656
2JST, TRIP, Chiyoda, Tokyo 102-0075
3JST, CREST, Bunkyo, Tokyo 113-8656
4Department of Physics, Kyoto University, Kyoto 606-8502

(Received August 24, 2009; Accepted September 8, 2009; Published November 10, 2009)

We study whether Fermi-surface (FS) nesting can give rise to high-temperature superconductivity in iron pnictides. Starting with ab initio construction of an effective four-orbital model, we employ the fluctuation–exchange approximation to show that FS does not necessarily favor the stripe antiferromagnetic order observed in experiments, especially for realistic electronic correlations. If superconductivity in iron pnictides is magnetically mediated and has a fully gapped sign-reversing s-wave symmetry, our results suggest that the pairing interaction does not arise only from FS nesting and that exchange interactions between local moments in the Fe 3d orbitals may play a crucial role. ©2009 The Physical Society of Japan

KEYWORDS: iron-based superconductor, magnetism, unconventional superconductivity
URL: http://jpsj.ipap.jp/link?JPSJ/78/113707/
DOI: 10.1143/JPSJ.78.113707


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