Abstract
Transport and low-frequency optical reflection measurements(180–380 GHz) are reported for the quasi-three-dimensional conducting alloyCu[(2,5(CH3)2–DCNQI)0.70(2,5(CD3)2–DCNQI)0.30]2 between room temperature and 35 K. The optical properties of the system are stronglyanisotropic. It is metallic down to 60 K where a Mott–Peierls phase transition occurs. Whilethe transverse conductivity remains practically unchanged, the longitudinal conductivityabruptly drops at the phase transition. Comparing our latest results with previous dc dataand measurements of the microwave conductivity also reported here, we find indications ofan ageing effect in these samples.
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