Abstract
rf and microwave properties of superconducting YBa2Cu3O7−x thin films were measured and analyzed using a coplanar resonator structure. The films were developed by sequential electron-beam evaporation of the metals followed by postanneal processing. dc properties of the films were obtained from resistance-temperature and current-voltage measurements to evaluate the transition temperature and current densities. High-frequency properties were measured from 70 to 10 K and in the frequency range 1–3 GHz to determine the film characteristics as compared to pure copper films on the same substrates.
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