Abstract
Temperature dependence of magnetic susceptibilities and lattice parameters is measured at ambient pressure in the title compounds, which are metallic down to the lowest temperature measured and have a mixed valence state of Cu. In (DMeDCNQI) 2 Cu an anomalously large susceptibility having a thermal hysteresis is found in the range below 100 K. This result combined with the change in the lattice parameter tells that (DMeDCNQI) 2 Cu is a marginal metal in which the number of stable Cu 2+ ions changes with temperature. It is pointed out that the reentrant behavior already found in the title compounds under respective pressure range has a close relation with the lattice-parameter change.
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