J. Phys. I France 2 (1992) 1497-1505
Non-linear dynamics of charge-density-wave in orthorombic TaS 3 at microwavesI. B. Vendik, V. M. Pchelkin and A. V. Shchepak
Electrical Engineering Institute, 5, Prof. Popov street, St. Petersburg, 197376, Russia
(Received 30 January 1992, accepted in final form 9 March 1992)
Non-linear dc and microwave conductivity due to collective transport of charge density-wave in TaS 3 was experimentally investigated at T=78-215 K. The non-linear dc field dependence of a differential conductivity exhibits a threshold field sharply defined in the temperature range of 140-215 K. As the temperature decreases beyond 140 K the field disappears, and the second threshold field originates. The two fields are temperature dependent and show decreasing under a microwave radiation. A non-linear response to the microwave radiation was observed at T=78-215 K in a mixing experiment (detuned case, ). The dc field dependencies of the non-linear response reveral no signs of the threshold field singularities. The experimental result have been satisfactorily described by a classical model of an overdamped oscillator by introducing an empirical distribution function for the threshold field and by averaging over .
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