J. Phys. IV France 12 (2002) Pr9-283
Comparison of elastic anomalies accompanying charge-density-wave depinning in TaS 3 and NbSe 3J.W. Brill1, X. Zhan1, D. Staresinic1, 2, A. Borovac1, 2 and K. Biljakovic2
1 Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506-0055, U.S.A.
2 Institute of Physics, P.O. Box 304, 10001 Zagreb, Croatia
We compare the electric field and frequency dependence of the complex shear moduli of the charge-density-wave (CDW) conductors, TaS 3 and NbSe 3. For both materials, the magnitudes of the shear moduli decrease when the CDW becomes depinned, but qualitatively different behaviors are observed for their internal friction. For TaS 3 the frequency dependence of the complex modulus seems to be well described in terms of relaxational dynamics, but this is not the case for NbSe 3. The anomalies are discussed in terms of different models of CDW response to crystal strain.
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