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Planar superconducting YBCO microwave mixer employing an engineered grain boundary weak link junction

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5 Author(s)
R. G. Seed ; Dept. of Electr. & Comput. Eng., Northeastern Univ., Boston, MA, USA ; P. C. Dorsey ; H. How ; A. Widom
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A microstrip transmission line was patterned from a superconducting YBa/sub 2/Cu/sub 3/O/sub 7-x/ film which was laser deposited on a SrTiO/sub 3/ bicrystal substrate. A microbridge in the microstrip was then patterned at the bicrystal interface to fabricate a superconducting grain boundary junction. Microwave mixing was observed with an input local oscillator frequency of 9.000 GHz, and an input signal frequency of 9.941 GHz. The output signal at 941 MHz was detected as a transmitted signal. The junction was current biased slightly above the critical current I/sub c/. The measured conversion loss was compared to the calculated value based upon a numerical solution of the equation for a superconducting weak link junction.<>

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IEEE Transactions on Applied Superconductivity  (Volume:4 ,  Issue: 3 )