Abstract

The resistivity and the thermopower of some radical salts of DMET and DIMET were measured down to liquid helium temperature. The radical salts of DIMET with linear and tetrahedral anions were newly found as metallic down to about 40 K. The temperature dependence of the resistivity and the thermopower below the metal-insulator transition was compared among the salts with linear anions and the possibility is pointed out that SDW transitions in these salts are not so simple as described by the mean-field theory. The temperature dependence of the resistivity and the thermopower of the salts with tetrahedral anions are complicated and the salts change into the insulating ground state after multiple steps.

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