Orbital-Fluctuation-Mediated Superconductivity in Iron Pnictides: Analysis of the Five-Orbital Hubbard-Holstein Model

Hiroshi Kontani and Seiichiro Onari
Phys. Rev. Lett. 104, 157001 – Published 15 April 2010

Abstract

In iron pnictides, we find that the moderate electron-phonon interaction due to the Fe-ion oscillation can induce the critical d-orbital fluctuations, without being prohibited by the Coulomb interaction. These fluctuations give rise to the strong pairing interaction for the s-wave superconducting (SC) state without sign reversal (s++-wave state), which is consistent with experimentally observed robustness of superconductivity against impurities. When the magnetic fluctuations due to Coulomb interaction are also strong, the SC state shows a smooth crossover from the s-wave state with sign reversal (s±-wave state) to the s++-wave state as impurity concentration increases.

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  • Received 11 December 2009

DOI:https://doi.org/10.1103/PhysRevLett.104.157001

©2010 American Physical Society

Authors & Affiliations

Hiroshi Kontani1 and Seiichiro Onari2

  • 1Department of Physics, Nagoya University and JST, TRIP, Furo-cho, Nagoya 464-8602, Japan
  • 2Department of Applied Physics, Nagoya University and JST, TRIP, Furo-cho, Nagoya 464-8602, Japan

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Issue

Vol. 104, Iss. 15 — 16 April 2010

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