Inductive measurements were performed on YBa2Cu3O7-δ(YBCO) films and superconducting / normal metal bilayers using Au, PrBa2Cu3O7-δ and (Y0.4Pr0.6)Ba2Cu3O7-δas normal material in order to investigate their screening properties between Tcand 2.2K. YBCO films were prepared using high pressure dc and hollow cathode sputtering, laser ablation, MOCVD and reactive thermal coevaporation and the penetration depth, λ,and the c-axis lattice parameter measured. Comparison of the temperature dependence of the superfluid density, ns(T), for the YBCO films showed a significant difference in the shape of ns(T) depending on the deposition method used. This could have implications for preparing stable passive microwave devices. We have also demonstrated that SN-bilayers, using YBCO as the superconductor, exhibit an enhanced screening over the entire temperature range compared with bare YBCO films.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering