The electrodynamics of a metallic surface layer in proximity contact to a superconductor are considered. The surface region is modeled as an idealized proximity-coupled superconductor/normal-metal (S/N) bilayer. Analytical expressions for the magnetic-field penetration into the sample are obtained. The behavior of the model and its applicability to magnetic-screening-length measurements on artificial and naturally occurring S/N bilayer superconductors are discussed in various limits. Calculations of the effective penetration depth λeff(T) reveal that unconventional penetration depth temperature dependences, such as {Δ}λeff(T){~}T found in YBa₂{Cu}₃O_7-δ crystals, are qualitatively reproduced with this model.
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Pambianchi et al. (1994) studied this question.
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