Phase Diagram of Two-Dimensional Organic Conductors: (BEDT-TTF)_<b>2</b>X

Abstract

The effects of on-site Coulomb interaction in two-dimensional organic conductors, κ-(BEDT-TTF) 2 X, α-(BEDT-TTF) 2 I 3 and (BEDT-TTF) 2 MHg(SCN) 4 , have been studied within the Hartree-Fock approximation. If the strength of Coulomb interaction exceeds some critical value, various kinds of antiferromagnetic states appear and these phases have been classified on a phase diagram with two key parameters, which leads to a unified view on the ground states of this unique family.