Abstract

The Meissner region induced by the proximity effect in the thick Cu clad wire is measured down to 21 mK. It is found that the thickness ϱ of the Meissner region in Cu becomes very large and still increases even at the lowest temperature in proportion to T - 1 2 . At low temperatures, ϱ becomes very sensitive to the magnetic field. Especially below about 40 40 mK, an abrupt decrease of ϱ is observed below about 200 mOe in increasing magnetic field.

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