Abstract
We have measured current-voltage characteristics of very small (0.4--0.02 ( m)S) Sn-SnO/sub x/-Sn tunnel junctions, having estimated charging energy eS/2C comparable to their other characteristic energies. In the higher-R/sub n/ devices, after rising just below T/sub c/, I/sub c/ decreases as the temperature is decreased further, and then increases again, at the lowest temperatures. Although the junctions are hysteretic, a significant resistance is found at currents below I/sub c/. We suggest an interpretation involving the quantum nature of phi and the competition between the charging, Josephson, and thermal energies of the system.
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