Nonmagnetic Insulating States near the Mott Transitions on Lattices with   Geometrical Frustration and Implications for $\kappa$-(ET)$_2$Cu$_2(CN)_3$
  We study phase diagrams of the Hubbard model on anisotropic triangular lattices, which also represents a model for $\kappa$-type BEDT-TTF compounds. In contrast with mean-field predictions, path-integral renormalization group calculations show a universal presence of nonmagnetic insulator sandwitched by antiferromagnetic insulator and paramagnetic metals. The nonmagnetic phase does not show a simple translational symmetry breakings such as flux phases, implying a genuine Mott insulator. We discuss possible relevance on the nonmagnetic insulating phase found in $\kappa$-(ET)$_2$Cu$_2(CN)_3$. 
Hidekazu Morita, Shinji Watanabe and Masatoshi Imada