Frequency dependent shear compliance of TaS3: Depinning relaxation spectraand search for a glass transition

At T approximate to 100 K, the magnitude of the shear compliance of TaS3 in creases by 25% with charge-density-wave (CDW) depinning by a de voltage. We have measured the strain frequency dependence of the complex compliance (j ) at different voltages, and fit it to distributions of Debye relaxation mo des. The sensitivity of the compliance to the structure of the CDW suggests that it would also be sensitive to a glass transition. However, we find th at both the real and imaginary parts of j are independent of frequency (wit hin 1%) when the CDW remains pinned for 8 K < T < 70 K. j is also independe nt (0.1%) of the frequency of small applied voltages, for which the dielect ric constant varies greatly. Therefore, if there is a glass transition at t hese temperatures, these results imply that either it does not involve rear rangement of the CDW domain structure or that the elastic response time rem ains > 1 s for the pinned CDW.