Abstract
The molecular compounds (Per)2M(mnt)2 where Per = perylene and mnt = maleonitriledithiolate are quasi-one dimensional conductors which undergo metal-to-semiconductor transitions towards a commensurate charge density wave (CDW) state, at T c = 8 K for M = Pt and T c = 12 K for M = Au. Above a threshold field, these molecular systems show nonlinear transport due to CDW motion as it is well demonstrated in the case of the Pt compound, where the Fourier analysis of the voltage at constant current clearly reveals one fundamental frequency proportional to the excess CDW current and several harmonics. A comparative study by pulsed current methods of the transient CDW dynamics is reported for these compounds, showing different threshold fields and variable degrees of CDW screening by the normal carriers. The temperature dependence of the threshold fields for both compounds is compared. The results are discussed in relation with current models for CDW transport.
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