Abstract
We show the preparation and properties of granular samples formed by a regular distribution of spherical Nb particles, about 2 μm in diameter, embedded in a Cu matrix. Measurements of magnetization, resistance and V× I curves show clearly the combined superconducting behavior of the weak coupling and bulk regimes. Our results are interpreted using an effective medium model for the Josephson coupling in a 3D array of grains. In special we have observed the predicted small oscillations in the critical current, measured as a function of the applied magnetic field.
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