J. Phys. I France
Volume 2, Numéro 7, July 1992
Page(s) 1497 - 1505
DOI: 10.1051/jp1:1992218
J. Phys. I France 2 (1992) 1497-1505

Non-linear dynamics of charge-density-wave in orthorombic TaS 3 at microwaves

I. 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 ${\rm d}I/{\rm d}V$ exhibits a threshold field $E_{\rm T1}$ sharply defined in the temperature range of 140-215 K. As the temperature decreases beyond 140 K the field $E_{\rm T1}$ disappears, and the second threshold field $E_{\rm T2}\gg E_{\rm T1}$ originates. The two fields are temperature dependent and show decreasing under a microwave radiation. A non-linear response $V_{\Omega}$ to the microwave radiation was observed at T=78-215 K in a mixing experiment (detuned case, $\Omega=\omega_1-\omega_2\,\,/\!\!\!\!\!\!\equiv 0$). The dc field dependencies of the non-linear response $V_{\Omega}$ 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 $V_{\Omega}$ over $E_{\rm T}$.

© Les Editions de Physique 1992

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