Abstract: We present a brief review of results on the surface impedance of cuprate superconductors, focusing mainly on YBa$-2$/Cu$-3$/O$-7$MIN$delta$/ (YBCO) and evidence of d-wave superconductivity in that material. We then discuss our recent results on Ba-K-Bi-O thin films, and the effects of DC electric fields on the surface impedance of YBCO films. A summary of our data on high quality thin films and single crystals of the electron-doped Nd$-1.85$/Ce$- 0.15$/CuO$-4$MIN$delta$/ (NCCO) cuprate superconductor follows. Surprisingly, the measurements on NCCO are consistent with the behavior of an s-wave BCS superconductor, in striking contrast to recent results on YBCO. Finally we discuss some of the interesting potential implications of d-wave superconductivity for microwave applications of the cuprates.!42
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机译：摘要：我们简要回顾一下铜酸盐超导体表面阻抗的结果，主要集中在YBa $ -2 $ / Cu $ -3 $ / O $ -7 $ MIN $ delta $ /（YBCO）和d-的证据在该材料中的波超导性。然后，我们讨论了我们在Ba-K-Bi-O薄膜上的最新结果，以及直流电场对YBCO薄膜表面阻抗的影响。以下是关于高质量薄膜和电子掺杂Nd $ -1.85 $ / Ce $-0.15 $ / CuO $ -4 $ MIN $ delta $ /（NCCO）铜酸盐超导体的数据的摘要。令人惊讶的是，在NCCO上的测量结果与s波BCS超导体的行为一致，这与YBCO的最新结果形成鲜明对比。最后，我们讨论了d波超导性对铜酸盐的微波应用的一些有趣的潜在影响。42
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