Phase diagram and gap anisotropy in iron-pnictide superconductors

Hiroaki Ikeda, Ryotaro Arita, and Jan Kuneš
Phys. Rev. B 81, 054502 – Published 5 February 2010

Abstract

Using the fluctuation-exchange approximation, we study an effective five-band Hubbard model for iron-pnictide superconductors obtained from the first-principles band structure. We preclude deformations of the Fermi surface due to electronic correlations by introducing a static potential, which mimics the effect of charge relaxation. Evaluating the Eliashberg equation for various dopings and interaction parameters, we find that superconductivity can sustain higher hole than electron doping. Analyzing the symmetry of the superconducting order parameter we observe clear differences between the hole- and electron-doped systems. We discuss the importance of the pnictogen height for superconductivity. Finally, we dissect the pairing interaction into various contributions, which allows us to clarify the relationship between the superconducting transition temperature and the proximity to the antiferromagnetic phase.

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  • Received 9 December 2009

DOI:https://doi.org/10.1103/PhysRevB.81.054502

©2010 American Physical Society

Authors & Affiliations

Hiroaki Ikeda1,*, Ryotaro Arita2,3,4, and Jan Kuneš5,6

  • 1Department of Physics, Kyoto University, Kyoto 606-8502, Japan
  • 2Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
  • 3TRIP, JST, Sanbancho, Chiyoda, Tokyo 102-0075, Japan
  • 4CREST, JST, Hongo, Tokyo 113-8656, Japan
  • 5Center for Electronic Correlations and Magnetism, Theoretical Physics III, University of Augsburg, 86135 Augsburg, Germany
  • 6Institute of Physics, Academy of Sciences of the Czech Republic, Cukrovarnická 10, 162 53 Praha 6, Czech Republic

  • *hiroaki@scphys.kyoto-u.ac.jp

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Vol. 81, Iss. 5 — 1 February 2010

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