Nonlinear Conductivity Due to Field-Induced Depinning of Charge-Density Waves in NbSe₃

Abstract

The conductivity σ e due to sliding charge-density-wave (CDW) was measured in the T 1 -CDW regime of NbSe 3 . The measurements were also carried out on both crystals doped with Ti and with Ta. At high temperatures, where the CDW is considered in the impurity pinning regime, it is found that the field dependence of σ e is independent both of depinning field and of the temperature, but it depends largely on a kind of the dominant impurity contained within the crystal. At low temperatures where the depinning field of the CDW is enhanced enormously, tone field dependence of σ e is different drastically from that observed at high temperatures.