High current-density Josephson edge-junction capacitance

Some properties of NbNb oxide-PbIn edge junctions and two-junction superconducting interferometers have been measured. From the voltage of the resonance involving the junction capacitance and interferometer inductance, we deduce that the specific capacitance of 2.5 μm2 junctions having a current density of 30 kA cm-2 is 20±4 μF cm-2. © 1981.