Electrical transport and magnetisation measurements on a 3D disordered superconductor-normal metal composite

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Abstract
The preparation and superconducting properties of a disordered 3D superconductor-normal metal composite are described. The composite consists of spherical micrometre-sized grains of Pb with a typical separation of 10 mu m embedded in a very pure Al matrix. The composite exhibits bulk diamagnetism and zero resistance well above the transition temperature of the Al matrix, and has a well defined critical current which varies exponentially with temperature. The effect of a magnetic field on the electrical transport properties is examined and discussed, as is the nature of the superconducting and dissipative states.