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Negative Magnetoresistance, Negative Electroresistance, And Metallic Behavior On The Insulating Side Of The Two-Dimensional Superconductor-Insulator Transition In Granular Pb Films, Richard P. Barber Jr., Shih-Ying Hsu, James M. Valles Jr., Robert C. Dynes, Rolfe Eldridge Glover Iii
Negative Magnetoresistance, Negative Electroresistance, And Metallic Behavior On The Insulating Side Of The Two-Dimensional Superconductor-Insulator Transition In Granular Pb Films, Richard P. Barber Jr., Shih-Ying Hsu, James M. Valles Jr., Robert C. Dynes, Rolfe Eldridge Glover Iii
Physics
Granular Pb thin films on the insulating side of the two-dimensional superconductor-insulator transition are observed to exhibit a large negative magnetoresistance and electroresistance change in resistance with electric field at low temperatures. At high measurement voltages and low temperatures, the film resistances become temperature independent creating a "metallic" state. These phenomena are explained as manifestations of transport due to intergranular quasiparticle tunneling. This explanation might also provide insights into the similar behavior observed in other superconductors.