Abstract
We calculate stress in YBa 2Cu 3O 7− x /MgO (YBCO/MgO) and YBa 2Cu 3O 7− x /LaAlO 3 (YBCO/LAO) by XRD of the sample, σ 1 = −1.2 GPa and σ 2 = −1.4 GPa, respectively, which shows that the stress in YBCO/LAO is stronger than that in YBCO/MgO. In addition, microwave response of the two pieces of thin films is also investigated by microstrip resonator technique. Surface resistance and penetration depth of the films are obtained by analyzing S 21 resonant curves of the microstrip resonator, the penetration depth λ 0 = 280 nm for YBCO/MgO and λ 0 = 265 nm for YBCO/LAO, and surface resistance R s = 0.376 mΩ for YBCO/MgO and R s = 2.660 mΩ for YBCO/LAO at 78 K, 10 GHz. The results show stronger stress in YBCO/LAO which lead to a larger microwave surface resistance than YBCO/MgO's. Some rational explanations are also analyzed and discussed in the paper.
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