Doping dependence of spin fluctuations and electron correlations in iron pnictides

Hiroaki Ikeda, Ryotaro Arita, and Jan Kuneš
Phys. Rev. B 82, 024508 – Published 14 July 2010

Abstract

Doping dependence of the spin fluctuations and the electron correlations in the effective five-band Hubbard model for iron pnictides is investigated using the fluctuation-exchange approximation. For a moderate hole doping, we find a dominant low-energy spin excitation at Q=(π,0), which becomes critical at low temperature. The low-energy spin excitations in the heavily hole-doped region are characterized by weak Q dependence. The electron doping leads to an appearance of a pseudogap in spin-excitation spectrum. Correspondingly, the NMR-1/T1 relaxation rate is strongly enhanced on the hole-doped side and suppressed on the electron-doped side of the phase diagram. This behavior can be to large extent understood by systematic changes of the Fermi-surface topology.

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  • Received 23 February 2010

DOI:https://doi.org/10.1103/PhysRevB.82.024508

©2010 American Physical Society

Authors & Affiliations

Hiroaki Ikeda1,2,*, Ryotaro Arita2,3,4, and Jan Kuneš5

  • 1Department of Physics, Kyoto University, Kyoto 606-8502, Japan
  • 2TRIP, JST, Sanbancho, Chiyoda, Tokyo 102-0075, Japan
  • 3Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
  • 4CREST, JST, Hongo, Tokyo 113-8656, Japan
  • 5Institute 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. 82, Iss. 2 — 1 July 2010

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