Possibility of dynamic transitions in sliding charge-density waves

The transport properties of charge-density waves have been studied in orthorhombic TaS3 as a function of the electric field. In the sliding state, we found that the power of the fundamental component of narrow-band noise has a minimum value at a bias voltage Vc. Moreover, the field dependence of the non-linear current carried by CDW changes abruptly at Vc. These results suggest the existence of a dynamic phase transition between plastic-flow phase and fluid-solid phase.