Abstract
We have investigated the microwave properties of a set of four identicalYBa2Cu3O7−δ (YBCO) films. One of the films has a 30% Ca-substituted YBCO overlayer, whereas thethree others are used as references to highlight the effect of the Ca substitution. Themicrowave characterization was carried out using the stripline-resonator technique. TheRs of the sample that has a Ca-rich overlayer increased slightly in the linear regime, whereasno significant effect on the nonlinear components and the intermodulation distortion hasbeen observed. We conclude that Ca doping does not significantly improve the nonlinearmicrowave properties of YBCO films, but the small changes in the linear surface resistancethat we observed are discussed in terms of the physics of Ca doping of YBCO.
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