Abstract
We demonstrate experimentally the existence of two different regimes of electron transport in the transition regions between Hall plateaus at high magnetic fields. One regime is found in the high-magnetic-field tail of a Shubnikov--de Haas peak, while the other one is in the remaining magnetic-field region of the peak. The magnetoresistance measured in the two regimes is shown to arise from different physical origins. The experiment supports the recent theory that predicts the existence of a percolating metallic electron system at high magnetic fields.
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