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 E⊗e 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 E⊗e 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.
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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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Hori, C., Maebashi, H. & Takada, Y. Superconductivity in a Correlated E⊗e Jahn–Teller System. J Supercond Nov Magn 25, 1369–1373 (2012). https://doi.org/10.1007/s10948-012-1518-0
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DOI: https://doi.org/10.1007/s10948-012-1518-0