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Experimental and theoretical studies on transport in semiconductor sampleswith superconducting electrodes are reported. We focus on the samples close tometal-insulator transition. In metallic samples, a peak of negativemagnetoresistance at fields lower than critical magnetic field of the leads wasobserved. This peak is attributed to restoration of a single-particle tunnelingemerging with suppression of superconductivity. The experimental results allowus to estimate tunneling transparency of the boundary between superconductorand metal. In contrast, for the insulating samples no such a peak was observed.We explain this behavior as related to properties of transport through thecontact between superconductor and hopping conductor. This effect can be usedto discriminate between weak localization and strong localization regimes.Comment: 10 pages, 3 fi

physical review. b, condensed matter and materials physics

Magnetoresistance of two-dimensional<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>p</mml:mi><mml:mtext>−</mml:mtext><mml:mi mathvariant="normal">Ga</mml:mi><mml:mi mathvariant="normal">As</mml:mi><mml:mo>∕</mml:mo><mml:msub><mml:mi mathvariant="normal">Al</mml:mi><mml:mn>10.3</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Ga</mml:mi><mml:mn>10.7</mml:mn></mml:msub><mml:mi mathvariant="normal">As</mml:mi></mml:mrow></mml:math>structures in…

Magnetoresistance of two-dimensionalp−GaAs∕Al10.3Ga10.7Asstructures in…