"Superconductor-Insulator transition" in a single Josephson junction

Details "Superconductor-Insulator transition" in a single Josephson junction "Superconductor-Insulator transition" in a single Josephson junction

1998-09-23

arxiv.org/abs/cond-mat/9809307v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

VI-curves of resistively shunted single Josephson junctions with different capacitances and tunneling resistances are found to display a crossover between two types of VI-curves: one without and another with a resistance bump (negative second derivative) at zero-bias. The crossover corresponds to the dissipative phase transition (superconductor-insulator transition) at which macroscopic quantum tunneling delocalizes the Josephson phase and destroys superconductivity. Our measured phase diagram does not agree with the diagram predicted by the original theory, but does coincide with a theory that takes into account the accuracy of voltage measurements and thermal fluctuations.

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