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Large normal resistance and THz electromagnetic‐wave response in YBaCuO step‐edge microbridge Josephson junction

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4 Author(s)
Fukumoto, Y. ; Superconducting & Cryogenic Technology Center, Kobe Steel, Ltd., 5‐5 Takatsukadai 1‐chome, Nishi‐ku, Kobe, Hyogo 651‐22, Japan ; Hayashi, S. ; Ogawa, Rikuo ; Kawate, Yoshio

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A YBaCuO Josephson junction with a large normal resistance (R) was fabricated and characterized. The junction exhibited an extremely sharp transition on the current‐voltage curve with R=10.8 Ω and IcR=1.8 mV at 15 K. The temperature dependence of critical current (Ic) of the junction was Ic∝(1-T/Tc), while another junction with a smaller R (0.57 Ω) showed a dependence of Ic∝(1-T/Tc)2. The difference can be explained by a picture of a grain boundary junction as a parallel array of superconductor‐normal‐superconductor and superconductor‐insulator‐superconductor elements. From the results of 110 GHz mixing experiments, it was shown that the present junction could be operative for electromagnetic waves over 2 THz.

Published in:

Applied Physics Letters  (Volume:64 ,  Issue: 6 )

Date of Publication:

Feb 1994

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