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A phase diagram is drawn in a parameter space of the nearly half-filledsingle band two-dimensional Hubbard model with U/t, t'/t and n as theparameters, U, t, t' and n being the on-site interaction, the nearest andsecond nearest neighbor transfer matrices and the number of electrons per site,respectively. The parameter space is chosen so as to include the models for thehigh-T_c cuprates as well as 2D-organic superconductors. The superconductingand antiferromagnetic instability surfaces are drawn from the results ofcalculations by using the spin fluctuation theory within the fluctuationexchange approximation. The metal-insulator transition surface is alsoindicated in the diagram. From this phase diagram we discuss the possibility ofthe spin fluctuation mechanism being the common origin of the superconductivityin the high-T_c cuprates and 2D-organic compounds.Comment: 5 pages, 3 eps figures, uses jpsj.sty, to appear in J. Phys. Soc.  Jpn, Vol. 68, No. 10, 199

Origin of Superconductivity in 2D-Organic Compounds and High-T c Cuprates

Origin of Superconductivity in 2D-Organic Compounds and High-T_c Cuprates