Abstract
Fluctuation-induced diamagnetism above the critical temperature was observed in Nb/Si superconductive multilayers, using an extremely sensitive superconducting quantum magnetometer. Samples were prepared in an ultrahigh-vacuum deposition system. When the Si layers were thick, two-dimensional behavior was observed and when the Si layers were thin, three-dimensional behavior was observed. An intermediate sample shows a crossover between the two- and three-dimensional behaviors. The experimental results were in good agreement with the theory of Gerhardts [Phys. Rev. B 9 (1974) 2945].
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