Meissner Effect and Magnetic Field Dependence of Cu Clad Nb in mK Region

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Abstract
The Meissner region induced by the proximity effect in a thick Cu clad Nb wire is measured down to 4.5 mK. It is found that the thickness ρ of the Meissner region in Cu increases with decreasing temperature in proportion to T -1/2. The magnetic field dependence of ρ is also studied in this temperature region. It is found that ρ decreases in proportion to ln H except for the very low field region, if ρ is sufficiently smaller than the thickness of Cu. And if ρ becomes comparable to the thickness of Cu, an anomalous behaviour is observed.

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