Abstract
Bulk superconductivity has been induced by the proximity effect with niobium in thick (3–15 μm), high purity silver at millikelvin temperatures. The spatial dependence of the local critical fields Hc(x) in silver has been determined by means of dc magnetization curves. The analysis shows a new, unexpected temperature and normal metal thickness dependence of the critical fields at the N-S interface, suggesting that new boundary conditions should be considered for the study of the proximity effect in clean, thick normal metals.
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