抄録
The effects of on-site Coulomb interaction in two-dimensional organic conductors, κ-(BEDT-TTF)_2X, α-(BEDT-TTF)_2I_3 and (BEDT-TTF)_2MHg(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.