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We have studied the quantized Hall effect of the two-dimensional electron gas in GaAs- AlₗGa₁-ₗAs heterojunctions at low temperatures to 50 mK. We observe in the small-current and low-temperature limit sharp steps connecting the quantized Hall resistance plateaus. The diagonal resistivity ₗₗ decreases with decreasing T at the Shubnikov---de Haas peaks, as well as at the dips, and is vanishingly small at magnetic fields above 40 kG.
Paalanen et al. (Thu,) studied this question.