Abstract
Inductive measurements were performed on YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// (YBCO) films and superconducting/normal metal bilayers using Au, PrBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// and (Y/sub 0.4/Pr/sub 0.6/)Ba/sub 2/Cu/sub 3/O/sub 7-/spl delta// as normal material in order to investigate their screening properties between T/sub c/ and 2.2 K. YBCO films were prepared using high pressure dc and hollow cathode sputtering, laser ablation, MOCVD and reactive thermal coevaporation and the penetration depth, /spl lambda/, and the c-axis lattice parameter measured. Comparison of the temperature dependence of the superfluid density, n/sub s/(T), for the YBCO films showed a significant difference in the shape of n/sub s/(T) depending on the deposition method used. This could have implications for preparing stable passive microwave devices. We have also demonstrate that SN-bilayers, using YBCO as the superconductor, exhibit an enhanced screening over the entire temperature range compared with bare YBCO films. >
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