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Nonlinear conduction in the quasi-one dimensional conductor o-TaS_3 has beenstudied in the low-temperature region down to 30 mK. It was found that attemperatures below a few Kelvins the current-voltage (I-V) characteristicsconsist of several branches. The temperature evolution of the I-V curveproceeds through sequential freezing-out of the branches. The origin of eachbranch is attributed to a particular strong pinning impurity type.  Similar behavior is expected for other physical systems with collectivetransport (spin-density waves, Wigner crystals, vortex lattices in type-IIsuperconductors etc.) in the presence of strong pinning centers.Comment: 11 pages, 3 ps figures, Revtex, To be published in Phys. Rev. Letters  (1997

physical review letters

Strong-Pinning Effects in Low-Temperature Creep: Charge-Density Waves in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>TaS</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Strong-Pinning Effects in Low-Temperature Creep: Charge-Density Waves inTaS3