Performance of a fully superconducting microwave cavity made of the high Tc superconductor Y1Ba2Cu3Oy

Zahopoulos, C.; Kennedy, W. L.; Sridhar, S.
June 1988
Applied Physics Letters;6/20/1988, Vol. 52 Issue 25, p2168
Academic Journal
We report the successful fabrication and characterization of a high Tc superconducting microwave cavity. The cavity made of bulk Y1Ba2Cu3Oy (Tc=93 K) and dielectrically loaded with sapphire was resonant at 8.00 GHz in the TE011 mode. At 77 K the Q was 104, which represents an improvement of a factor of 11 from the normal state. At 4.2 K the Q was nearly 105. The temperature dependence of the Q correlates extremely well with the microwave surface resistance of a test sample measured independently, clearly showing that the Q was limited by the intrinsic materials preparation and not by extraneous factors.


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