A Mechanism of Spin-Triplet Superconductivity in Hubbard Model on Triangular La ttice: Application to UNi_2Al_3

Abstract

We discuss the possibility of spin-triplet superconductivity in a two-dimensional Hubbard model on a triangular lattice within the third-order perturbation theory. When we vary the symmetry in the dispersion of the bare energy band from D_2 to D_6, spin-singlet superconductivity in the D_2-symmetric system is suppressed and we obtain spin-triplet superconductivity in near the D_6-symmetric system. In this case, it is found that the vertex terms, which are not included in the interaction mediated by the spin fluctuation, are essential for realizing the spin-triplet pairing. We point out the possibility that obtained results correspond to the difference between the superconductivity of UNi_2Al_3 and that of UPd_2Al_3.

arXiv comment11pages, 5figures

References in corpus (4)

• Perturbation Theory on the Transition Temperature and Electronic Properties of Organic Superconductor
• Spin-triplet superconductivity in repulsive Hubbard models with disconnected Fermi surfaces: a case study on triangular and honeycomb lattices
• Perturbation Theory on the Superconductivity of Heavy Fermion Superconductors CeIr_{x}Co_{1-x}In_5
• Perturbation Theory on the Superconductivity of Heavy Fermion Superconductor UPd_2Al_3

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• Numerical study of magnetic and pairing correlation in bilayer triangular lattice
• Theory of tunneling spectroscopy in UPd2Al3
• Magnetic fluctuation and dominant superconducting pairing symmetry near the tunable Van Hove singularity