Possible Charge Disproportionation and New Type Charge Localization in θ-(BEDT-TTF)₂CsZn(SCN)₄

Abstract

¹H-NMR, EPR and static magnetic susceptibility measurements have been performed on an organic conductor, θ-(BEDT-TTF)₂CsZn(SCN)₄. The ¹H-NMR-T₁^-1 and the spin susceptibility exhibit anomalous enhancements at low temperatures. Around 20 K, where the spin susceptibility shows a minimum, the principal axes of the EPR g-tensor changed their directions, keeping the principal values constant. It indicates a possible change of the electronic nature. The low-temperature electronic state is discussed.