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We report magnetoresistance measurements on a two-dimensional electron gas made from a high-mobility GaAs/Alₓ{Ga}_{1{{-}}x}$As heterostructure, where the externally applied magnetic field was expelled from regions of the semiconductor by means of superconducting lead grains randomly distributed on the surface of the sample. A theoretical explanation in excellent agreement with the experiment is given within the framework of the semiclassical Boltzmann equation.
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Smith et al. (1994) studied this question.
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