Abstract
Very dilute bulk dispersions of micrometer-sized particles of Pb in Zn show resistive superconducting transitions at up to 3 K, far above that of Zn itself (0.8 K), although the Pb volume fraction is only 0.006. The $I\ensuremath{-}V$ characteristics contain reproducible structure that is not understood. At lower temperatures the samples expel a small, but significant, amount of flux. The superconducting transition can be explained in terms of proximity-effect coupling of the Pb grains through the Zn matrix.
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