Abstract
The generation of harmonics of a small ac modulation field is used, in conjunction with the standard current-voltage measurement, to study the depinning behavior in well-characterized and high-purity samples of the charge-density-wave conductor ${\mathrm{NbSe}}_{3}$. The results show that the current carried by the charge density wave obeys a scaling law: ${I}_{\mathrm{CDW}=[(\mathrm{V}\mathrm{\ensuremath{-}}{V}_{T})/{V}_{T}{]}^{\ensuremath{\zeta}}}$ with \ensuremath{\zeta}=1.23\ifmmode\pm\else\textpm\fi{}0.07. Implications of this result on the various theoretical models of the dynamics of the sliding state are discussed.
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