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Superconductivity in a Correlated Ee Jahn–Teller System

  • Chishin Hori
  • Hideaki Maebashi
  • Yasutami Takada
Original Paper

Abstract

By numerically solving the Eliashberg equation in the RPA as well as employing the Landau’s theory for phase transitions, we have investigated superconductivity, especially its pairing character, in a two-orbital Hubbard model coupled with Ee Jahn–Teller phonons on a two-dimensional square lattice at half filling. If the electron hopping between neighboring sites keeps the orbital character invariant in this Ee Jahn–Teller crystal, we find that a new superconducting phase characterized by the pairing of spin singlet, orbital singlet, and odd in momentum space, named a chiral p-wave pairing, is brought about by the collaboration of orbital fluctuations enhanced mainly by the electron–phonon interaction with spin fluctuations induced by the electron–electron one.

Keywords

Superconductivity Jahn–Teller interaction Orbital fluctuation Two-orbital Hubbard model 

Notes

Acknowledgements

This work is partially supported by Global COE Program “the Physical Sciences Frontier,” a Grant-in-Aid for Scientific Research (C) (No. 21540353), and Innovative Area “Materials Design through Computics: Complex Correlation and Non-Equillibrium Dynamics” (No. 22104011) from MEXT, Japan.

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Chishin Hori
    • 1
  • Hideaki Maebashi
    • 1
  • Yasutami Takada
    • 1
  1. 1.Institute for Solid State PhysicsUniversity of TokyoKashiwaJapan

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