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Metastable length states of a random system: TaS3.

The sample length of the charge-density-wave (CDW) conductor TaS 3 is found to be a sensitive function of the applied dc bias electric field E and time t. The length reffects transitions through metastable CDW configurations for both the pinned and sliding CDW in the presence of random impurities. Although a simple theoretical model can account for some qualitative features of the experimental findings, our experimental results are inconsistent with present CDW elasticity theory