We have synthesized specimens of nanometric lead dispersion in a glassy Al–Cu–V matrix by rapid solidification of the corresponding melt. The microstructure has been designed to avoid superconducting percolation due to coupling of the neighboring particles by the proximity effect. Using these specimens, we have determined quantitatively the effect of size of the ultrafine lead particles on the superconducting transition.
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Tsai et al. (1999) studied this question.
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