Microwave properties of YB2Cu3O7-x thin films characterized by an open resonator

Shi Ping Zhou; Ke Qin Wu; A. Jabbar; Jia-Shan Bao; Weigen Luo; Aili Ding; Faji Wang

doi:10.1117/12.47206

1 November 1991 Microwave properties of YB₂Cu₃O_7-x thin films characterized by an open resonator

Shi Ping Zhou, Ke Qin Wu, A. Jabbar, Jia-Shan Bao, Weigen Luo, Aili Ding, Faji Wang

Proceedings Volume 1519, International Conference on Thin Film Physics and Applications; (1991) https://doi.org/10.1117/12.47206
Event: International Conference on Thin Film Physics and Applications, 1991, Shanghai, China

Abstract

We have performed millimeter-wave frequency (94 GHz) measurements on high quality YBa₂Cu₃O_7-x superconducting films on yttrium stabilized (100) ZrO₂, MgO substrates. The 0.2 micrometers thin films fabricated by the magnetron sputtering in- situ technique with the YBa₂Cu₃O_7-x powders as the target exhibit superconducting transition temperature up to 88 K, critical current density of 6 * 10⁵ A/cm² 77 K. X-ray diffraction spectrum, as well as scanning electron microscope photos, indicate these thin films are fully c-axis oriented, extremely high in density, and universally homogeneous. Millimeter-wave surface resistances have been measured on a hemisphere open resonator in the temperature range of 20 K to Tc and beyond. Surface resistance value at 94 GHz and 77 K for these films are found to be about 30 m(Omega) , nearly 1/4 as that for copper, and a two orders drop in the surface resistance within 4 K is observed. That indicates these films to be good materials for the application in millimeter- wave range, especially for fabricating microwave devices. We observed such low surface resistance in these thin films by virtue of the near absence of grain and phase boundaries in these films coupled with their high degree of crystalline orientation.

Citation Download Citation

Shi Ping Zhou, Ke Qin Wu, A. Jabbar, Jia-Shan Bao, Weigen Luo, Aili Ding, and Faji Wang "Microwave properties of YB₂Cu₃O_7-x thin films characterized by an open resonator", Proc. SPIE 1519, International Conference on Thin Film Physics and Applications, (1 November 1991); https://doi.org/10.1117/12.47206

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