Spin Fluctuation-Induced Superconductivity in Organic Compounds.

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  • Kondo Hisashi
    Department of Physics, Faculty of Science and Technology, Science University of Tokyo, Noda 278–8510
  • Moriya Toru
    Department of Physics, Faculty of Science and Technology, Science University of Tokyo, Noda 278–8510

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  • Spin Fluctuation-Induced Superconductiv

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Spin fluctuation-induced superconductivity in two-dimensional organic compounds such as κ-(ET)2X is investigated using a simplified dimer Hubbard model with a right-angled isosceles triangular lattice (transfer matrices -τ, -τ′). The dynamical susceptibility and the self-energy are calculated self-consistently within the fluctuation exchange approximation, and the value for Tc obtained by solving the linearized Eliashberg-type equations is in good agreement with the experimental results. The pairing symmetry is of the dx2-y2 type. The calculated \left( U/τ \right)-dependence of Tc compares qualitatively well with the observed pressure dependence of Tc. Varying the value for τ′/τ from 0 to 1, we interpolate between the square lattice and the regular triangular lattice and find first that relative values of Tc for κ-(ET)2X and cuprates are reasonably explained and second that Tc tends to decrease with increasing τ′/ τ. No superconductivity is found for τ′/τ = 1, the regular triangular lattice.

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