Self-biased Josephson junctions

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Abstract
Transport currents in one leg of a cross strip superconducting-normal metal-superconducting Josephson junction have been used to bias the current-voltage characteristics of the junction, and hence use the junction as a control element. The bias current creates a magnetic field in the junction, which in turn modulates the Josephson currents. As the bias current causes successive flux quanta to enter the junction, the Josephson critical current shows current-voltage curves similar to the resistively shunted junction model and a normal Fraunhofer pattern. Values of the bias are relatively small because the junctions are so thick. A detailed study of the junction voltage as a function of bias current shows reentrant superconductivity as successive vortices enter the junction.

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