Abstract
ESR (Electron Spin Resonance) in (BEDT-TTF)3Li0.5Hg(SCN)4(H2O)2 (abbreviated as Li salt) has been measured down to liquid He temperature. The ESR studies for α-(BEDT-TTF)2 XHg(SCN)4 (X=K and Rb) salts which have suggested the coexistence of metallic state with a magnetic ordered state [1] have stimulated this work. We studied Li salt to study whether the M-I transition is magnetic or not. In the insulating state, we have seen two pairs of sharp peaks with strong and weak intensities. Our X-ray analysis shows no twinning effect. We analyzed the g-value data for the stronger pair, and got the principal g-values consistent with the localized hole on the BEDT-TTF molecules. We cannot expect two kinds of signals from the room temperature crystal structure. One of the possible origin of the two strong pairs of resonance is due to the carriers localized at the ends of the BEDT-TTF molecules.
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