THEORY OF POINT CONTACT SPECTRA FOR SYSTEM METAL TIP-SUPERCONDUCTOR WITH INTERNAL JOSEPHSON JUNCTION

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Abstract
We report on the calculations of current-voltage characteristics and dynamical resistivity for a model system (series connected point contact metal — superconductor and Josephson junction of the S-N-S type) as a function of applied voltage. Calculated shape of dV/dI as a function of V shows some qualitative agreement with measured curves on real low-resistivity point contacts of the type metal tip – ceramic superconductor (LaBaCuO, YBaCuO). Method for determination of the energy gap is proposed.

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