ac Josephson current as a function of voltage
A. I. AkimenkoLow Temperature Physicotechnical Institute, Academy of Sciences of the Ukrainian SSRВ. С. СоловьевLow Temperature Physicotechnical Institute, Academy of Sciences of the Ukrainian SSRI. K. YansonLow Temperature Physicotechnical Institute, Academy of Sciences of the Ukrainian SSR
ABI
Аннотация
The superconductive current flowing through niobium point contacts was measured as a function of applied voltage using a bridge circuit. With the assumption that the de component of the superconductive current is proportional to the amplitude of the ac Josephson current, the latter was determined as a function of the voltage applied to the contact. For eV >2Δ the results agree qualitatively with theory. A maximum in the superconductive current (the Riedel peak) was observed in the superconducting current-voltage curves and in the curve of if signal amplitude versus voltage in experiments involving the mixing of two uhf signals.
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