Abstract
We have studied the electronic state in new type of organic conductors (DMe-DCNQI) 2Cu, (DMeO-DCNQI) 2Cu and (DMe 1-xMcBr x-DCNQI) 2 Cu (0< x<0.10), measuring the low temperature specific heat and magnetic susceptibility. For the sample of (DMe 0.945MeBr 0.055-DCNQI) 2Cu, which reveals puzzling reentrant behavior in resistivity (metal- insulator- metal) with lowering temperature, an extraordinary enhancement of density of states at Fermi level is observed. Such remarkable properties of these Cu salts are discussed based on the mixed-valency of Cu atoms, which implies the mixing of 3d electrons of Cu into 2pπ conduction band of DCNQI through Cu-N coordination bond.
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