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Accurate microwave technique of surface resistance measurement of large-area HTS films using sapphire quasi-optical resonator

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5 Author(s)
N. Cherpak ; Usikov Inst. of Radiophys. & Electron., Nat. Acad. of Sci., Kharkiv, Ukraine ; A. Barannik ; Yu. Filipov ; Yu. Prokopenko
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We have developed a surface resistance (Rs) measurement technique for large-area high-temperature superconducting (HTS) films using quasioptical dielectric resonators (QDR) with HTS endplates (quasioptical Hakki-Coleman resonators). In this technique, the highest Q modes, namely whispering-gallery modes, in sapphire disk sandwiched between HTS films or between one HTS film and one Cu endplate are excited at K-band frequencies. The authors report on measurement results of surface resistance of 52 mm diameter high-quality YBCO thin films. The measurement results revealed that the technique is feasible for accurate Rs-measurements of large-area thin films. The method is appropriate for standard measurement of Rs at millimeter wave frequencies by analogy with classic DR-based microwave technique, although QDR-based technique has some fundamental differences.

Published in:

IEEE Transactions on Applied Superconductivity  (Volume:13 ,  Issue: 2 )