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2 July 1994 Effect of different coupling modes on the high-frequency response of YBCO microwave SQUIDs
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Proceedings Volume 2160, Superconductive Devices and Circuits; (1994)
Event: OE/LASE '94, 1994, Los Angeles, CA, United States
The effect of microwave and dc magnetic fields on the unloaded quality factor and the resonant frequency of two differently coupled hysteretic 3 GHz microwave SQUIDs was investigated. The SQUID loops are integrated into and solely inductively coupled to the superconducting resonator, respectively. The dissipative and the reactive response are analyzed in terms of a phenomenological model by Silver and Zimmerman. The temperature dependencies of the threshold field for microwave induced quantum transitions and of the coupling strength between SQUID ring and resonator are discussed. Conditions for optimized operation are deduced for both samples. The results indicate that it is possible to reduce the coupling coefficient, k2, by a suitable loop design while maintaining, at a reduced temperature, a sufficiently large dc field induced variation of the microwave losses (transfer function).
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Matthias A. Hein, M. Strupp, G. Mueller, H. Piel, Y. Zhang, and Alex I. Braginski "Effect of different coupling modes on the high-frequency response of YBCO microwave SQUIDs", Proc. SPIE 2160, Superconductive Devices and Circuits, (2 July 1994);

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