Theory of anomalous electrical conduction in NbSe3

A Brownian-particle picture, based on the commensurability pinning model, is proposed and examined for the dynamics of a charge-density-wave condensate in a constant electric field. The theory can predict the anomalous transport properties of Nb${\mathrm{Se}}_3$. Quantum effects due to tunneling are shown to be unimportant compared with thermal effects at temperatures $\mathrm{kT}\gtrsim \hslash {\omega }_F$, where ${\omega }_F$ is a pinning frequency of the charge-density wave.