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VOLUME 56 (1992) | ISSUE 6 | PAGE 311
Crossover from superconductivity to a negative magnetoresistance in a Cd-Sb alloy near the localization threshold as the temperature is lowered
The evolution of the superconducting response in various stages of the amorphization of a metastable metallic phase of the alloy Cd43Sb57 has been studied. This amorphization is accompanied by a metal-insulator transition. On the insulator side of the transition, a superconducting response is observed in fields Η < 1.5 Τ at J~3 К. At T< 1 К, this superconducting response gives way to a negative magnetoresistance characteristic of a hopping conductivity.