Current-controlled superconductive bridge contacts

A theory is offered for weakly coupled superconductive structures in which the critical bridge (film) current is varried by passing a current perpendicular to the transport current through a weak spot. Various types of such current-controlled contacts are considered (film–film, film–bridge, bridge–bridge). Josephson multiports are considered as a general case and boundary conditions are obtained for the order parameter in the weak intersection region. An expression is obtained for maximum superconductive current in the transport circuit as a function of control current. It is established that the effect of change in the maximum transport current appears at control currents close to critical, and in the resistive state of the control circuit.

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