Negative magnetoresistance of granular indium films

It is found that for granular indium films with activated conductivity and complete suppression of Josephson tunneling between the grains the transition of grains into the superconducting state is accompanied by a large additional increase in the resistance as the temperature is lowered. A magnetic field weakens this effect, which leads to anomalously large negative magnetoresistance. A qualitative explanation of this effect, taking into account the decrease in the number of normal electrons in the grains as they make the transition into the superconducting state, is given.

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