Magnetic screening in proximity-coupled superconductor/normal-metal bilayers

Michael S. Pambianchi; Jian Mao; Steven M. Anlage

doi:10.1103/PhysRevB.50.13659

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Magnetic screening in proximity-coupled superconductor/normal-metal bilayers

Michael S. Pambianchi, Jian Mao, Steven M. Anlage

DOI 10.1103/PhysRevB.50.13659 · Physical Review B

T1

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Abstract

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 Δλeff(T)∼T found in YBa2Cu3O7−δ crystals, are qualitatively reproduced with this model.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown