Charge-density-wave conductivity in NbSe3

The nonlinear conductivity in the charge-density-wave states in NbSe₃ was measured up to the high-field limit. Ohmicity recurs in this limit. The temperature dependence of σ_eo, the extra conductivity in the high-field limit, is in agreement with that of carrier concentration condensed into the CDW, providing an evidence that the nonlinear conductivity is due to CDW motion. The magnitude of σ_eo is very sensitive to the impurity concentration. The mobility of the drifting CDW's is temperature independent and the damping of them is mainly due to the impurity scattering in even pure crystals.