Frank R. Libsch, Takatoshi Tsujimura
Active Matrix Liquid Crystal Displays Technology and Applications 1997
We report measurements of the magnitude and phase of microwave transmission through thin films (1 m) of the 90-K superconductor YBa2Cu3O7 on Al2O3, MgO, and ZrO2 substrates. Real and imaginary parts of the conductivity, 1 and 2, were evaluated from the measurements by comparing with a calculation of the transmission for our experimental configuration. Both parts of the conductivity show qualitative agreement with Bardeen-Cooper-Schrieffer type conductivities. From 1 we find a range of gap values 2kBTc=1.3 to 6.5. From the measured 1 the magnetic penetration depth can be evaluated. © 1988 The American Physical Society.