A Mechanism of Spin-Triplet Superconductivity in Hubbard Model on Triangular Lattice: Application to UNi<sub>2</sub>Al<sub>3</sub>

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  • A Mechanism of Spin-Triplet Superconductivity in Hubbard Model on Triangular Lattice: Application to UNi2Al3.
  • Mechanism of Spin Triplet Superconductivity in Hubbard Model on Triangular Lattice Application to UNi2Al3

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説明

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 D2 to D6, spin-singlet superconductivity in the D2-symmetric system is suppressed and we obtain spin-triplet superconductivity in near the D6-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 UNi2Al3 and that of UPd2Al3.

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