Strong-coupling theory of superconductivity in a degenerate Hubbard model

Details Strong-coupling theory of superconductivity in a degenerate Hubbard model Strong-coupling theory of superconductivity in a degenerate Hubbard model

2003-09-25

arxiv.org/abs/cond-mat/0309575v1

Physics

Condensed Matter

Superconductivity

4 figures, submitted to PRB

Scientific paper

10.1103/PhysRevB.69.104504

In order to discuss superconductivity in orbital degenerate systems, a microscopic Hamiltonian is introduced. Based on the degenerate model, a strong-coupling theory of superconductivity is developed within the fluctuation exchange (FLEX) approximation where spin and orbital fluctuations, spectra of electron, and superconducting gap function are self-consistently determined. Applying the FLEX approximation to the orbital degenerate model, it is shown that the $d_{x^2-y^2}$-wave superconducting phase is induced by increasing the orbital splitting energy which leads to the development and suppression of the spin and orbital fluctuations, respectively. It is proposed that the orbital splitting energy is a controlling parameter changing from the paramagnetic to the antiferromagnetic phase with the $d_{x^2-y^2}$-wave superconducting phase in between.

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