Possible Charge Disproportionation and New Type Charge Localization in<i>θ</i>-(BEDT-TTF)_<b>2</b>CsZn(SCN)_<b>4</b>

Abstract

1 H-NMR, EPR and static magnetic susceptibility measurements have been performed on an organic conductor, θ-(BEDT-TTF) 2 CsZn(SCN) 4 . The 1 H-NMR- T 1 -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.