engleski

Mott-Peierls phase in deuterated copper-DCNQI systems : a comprehensive study of longitudinal and transverse conductivity and aging effects

Transport and low-frequency optical reflection measurements (180-380 GHz) are reported for the quasi-three-dimensional conducting alloy Cu[(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 strongly anisotropic. It is metallic down to 60 K where a Mott-Peierls phase transition occurs. While the transverse conductivity remains practically unchanged, the longitudinal conductivity abruptly drops at the phase transition. Comparing our latest results with previous dc data and measurements of the microwave conductivity also reported here, we find indications of an ageing effect in these samples.

charge-density wave; transport anisotropy; dc; microwave and optical conductivity; ageing effects

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