Perturbation Theory for a Repulsive Hubbard Model in Quasi-One-Dimensional Superconductors (Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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We investigate pairing symmetry and transition temperature in a quasi-one-dimensional repulsive Hubbard model. We solve the Eliashberg equation using the third-order perturbation expansion with respect to the on-site repulsion U. We find that when the electron number density is shifted from the half-filled state, a transition into unconventional superconductivity is expected. When one-dimensionality is weak, a spin-singlet state is favorable. In contrast, when one-dimensionality is strong and electron number density is far from the half-filled state, a spin-triplet state is stabilized. Finally, we discuss the possibility of unconventional superconductivity caused by the on-site Coulomb repulsion in β-Na_<0.33>V_2O_5.
社団法人日本物理学会の論文
2004-04-15