We report measurements of the nonlinear current-voltage characteristics on low-carrier-concentration n-type samples of Hg0.76{Cd}0.24$Te at high magnetic fields and low temperatures. We find the onset of nonlinear conductivity occurs at applied electric fields of less than 1 mV/cm. The effect can be easily distinguished from sample heating and is consistent with collective transport produced by the sliding of a Wigner crystal pinned by disorder. We estimate a disorder-induced correlation length of tens of micrometers.
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Field et al. (1986) studied this question.
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