Abstract
In semiconducting linear chain compounds with charge-density wave ground states a novel type of collective excitation appears at low temperatures. In the low field, insulating states the response for small amplitude a.c. excitations reveals a frequency independent dielectric constant up to a few GHz (with magnitude of ε ≃ 106), and a narrow resonance peak in the millimeter wave frequency range. The collective electron transport due to the sliding condensate is characterized by a rapid depinning process at a sharp threshold field and by an unusually low damping in the current carrying state. Our observations suggest that the internal degrees of freedom play minor role in the CDW dynamics when normal carriers are frozen out. These results are contrasted to the conventional CDW conduction at higher temperatures.
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