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A film transmission line resonator to measure the microwave surface resistance of YBa2Cu3O7-x

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5 Author(s)
J. S. Martens ; Dept. of Electr. & Comput. Eng., Wisconsin Univ., Madison, WI, USA ; G. K. G. Hohenwarter ; D. P. McGinnis ; J. B. Beyer
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The authors constructed microstrip transmission line resonators with YBa2Cu3O6.9 ground planes, SiO dielectric, and Nb top conductors. The film resonator is a low-impedance section nλ/2 long, and the wave is launched from a coaxial line. Loose coupling is provided by the discontinuity between 50-Ω feed lines and the 0.05-Ω resonator section. After de-embedding the transmittance data of the structure, the surface resistance of the ceramic superconductor can be computed. The surface resistance of YBa2Cu3O6.9 at 4.2 K was about a factor of 60 higher than the theoretical value for Nb at 4.2 K over the range 2.9-6 GHz. The power law behavior versus frequency of the surface resistance is roughly quadratic, which is consistent with two-fluid analysis

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IEEE Transactions on Magnetics  (Volume:25 ,  Issue: 2 )