Nonmagnetic Insulating States near the Mott Transitions on Lattices with Geometrical Frustration and Implications for $κ$-(ET)$_2$Cu$_2(CN)_3$

Hidekazu Morita; Shinji Watanabe; Masatoshi Imada

doi:10.1143/JPSJ.71.2109

paper

Nonmagnetic Insulating States near the Mott Transitions on Lattices with Geometrical Frustration and Implications for $κ$ -(ET) $_{2}$ Cu $_{2} (C N)_{3}$

arXiv:cond-mat/0203020 · doi:10.1143/JPSJ.71.2109

Abstract

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 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 $κ$ -(ET) $_{2}$ Cu $_{2} (C N)_{3}$ .

4pages including 7 figures

Nonmagnetic Insulating States near the Mott Transitions on Lattices with Geometrical Frustration and Implications for κ-(ET)2​Cu2​(CN)3​

Abstract

Nonmagnetic Insulating States near the Mott Transitions on Lattices with Geometrical Frustration and Implications for $κ$ -(ET) $_{2}$ Cu $_{2} (C N)_{3}$