We have performed magnetoresistance and Hall-resistance measurements on low-carrier-concentration n-type samples of Hg0.76{Cd}0.24$Te at millikelvin temperatures. We observe an abrupt rise in the Hall resistance and magnetoresistance at a characteristic field ${H}c$ which is a significant function of temperature and which allows us to reject magnetic freezeout or localization by disorder as possible mechanisms. We believe our data provide compelling evidence for a model where the magnetic field induces localization of the electrons into a three-dimensional Wigner lattice.
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Rosenbaum et al. (1985) studied this question.
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