New Josephson-like effect in a superconducting transformer

The coupled motion of the vortex lattices of two electrically insulated, superimposed, superconducting thin films (primary and secondary) in a perpendicular magnetic field, is predicted to exhibit a Josephson-like behavior. For a dc applied current flowing in the primary film, the voltage difference between the time-averaged primary and secondary flux flow voltages obeys the equations of a resistively shunted junction model. If an ac current is superimposed on the dc current, Shapiro-type steps are predicted in the current-voltage characteristic. In contrast to the conventional Josephson effect; the voltage positions of these steps can be tuned by the applied magnetic field.