ECRYS - 93
J. Phys. IV France 03 (1993) C2-33-C2-38
Narrow-band "noise" and damping in NbSe3J. RICHARD1, J. CHEN1 and S.N. ARTEMENKO2
1 Centre de Recherches sur les Très Basses Températures, Laboratoire associé à l'Université Joseph Fourier, CNRS, BP. 166, 38042 Grenoble cedex 9, France
2 Institute of Radio-Engineering and Electronics Academy of Sciences of Russia
We report the results of a Narrow-band "Noise" (NBN) study, in NbSe3 for magnetic fields up to 19 T and temperatures as low as 15 K. The first result of this NBN study is the observation of the decrease of dJCDW/dv with decreasing temperatures for both transitions. We report also new values for the absolute value dJCDW/dv for both transitions, and the existence of a curvature of dJCDW/dv versus frequency, in low frequency range. We have interpreted the decrease of dJCDW/dv with temperatures in terms of Artemenko's theory which has been used in 1984 to explain the non-linear Hall effect in TaS3. The total longitudinal current is given by [MATH], where the therm -AJCDW is a backward normal current flow due to the movin CDW. From the saturing value of dE/dv obtained in high electric field we have deducedet the total damping parameter [MATH] which is decreasing with temperature. Using data obtained under application of a magnetic field of 7 T and the Wonneberger's theory for the ac response of the collective mode, we have deduced the thermal variation of the bare phason damping coefficient [MATH]. We report that for [MATH] very close to the theoretical predictions of Takada, Wong and Holstein.
© EDP Sciences 1993