We report the observation of strongly nonlinear conductivity with a sharp threshold field and a giant dielectric constant in the charge-density-wave state of Ta${\mathrm{S}}_3$. We argue that these properties reflect the dynamical behavior of the charge-density-wave condensate, and compare the observed behavior with the properties of Nb${\mathrm{Se}}_3$.

• Received 14 March 1981

DOI:https://doi.org/10.1103/PhysRevLett.47.64