rf surface resistance of Y-Ba-Cu-O thin films

Abstract
The rf surface resistance of superconducting Y-Ba-Cu-O thin films has been measured using a stripline resonator technique. The electron-beam-evaporated films have been measured from 0.6 to 17.4 GHz and from 4.2 to 8 K. The surface resistance reaches as low as 3.9 × 104 Ω at the lowest frequency, and is expected to improve significantly as the film quality is optimized.