Spatial distribution of nonlinear current in NbSe₃

Abstract
Spatial distribution of the electric potential has been studied in NbSe₃ in both linear and nonlinear regimes. In the nonlinear regime two characteristic distances were found. The larger one corresponds to a long-scale smooth spatial variation of the nonlinear current and is close to the sample length. A simple mode1 of dislocation motion accounted for such behaviour is offered. the smaller one depends on the nonlinear current and may be related with injection of CDW excitations having the life-time of a few milliseconds.