Abstract
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.
Original language | English |
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Article number | 134516 |
Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 73 |
Issue number | 13 |
DOIs | |
State | Published - 2006 |