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Nonmagnetic Insulating States near the Mott Transitions on Lattices with Geometrical Frustration and Implications for κ-(ET)<sub>2</sub>Cu<sub>2</sub>(CN)<sub>3</sub>
We study phase diagrams of the Hubbard model on anisotropic triangular lattices, which also represents a model for κ-type BEDT-TTF compounds. In contrast with mean-field predictions, path-integral renormalization group calculations show a universal presence of a nonmagnetic insulator sandwiched by an antiferromagnetic insulator and paramagnetic metals. The nonmagnetic phase does …