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Improvement of the sandwich junction properties by planarization of YBCO films

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5 Author(s)
Maruyama, M. ; Dept. of Quantum Eng., Nagoya Univ., Japan ; Yoshida, K. ; Horibe, M. ; Fujimaki, A.
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We have improved the properties of c-axis-oriented YBCO/PBCO/YBCO trilayer junctions using planarization of YBCO films. The root-mean-square value of the film roughness reduces to less than 60% of that of an as-grown film. The junctions made through the planarization exhibit RSJ-like current-voltage characteristics even for 20-nm-thick PBCO interlayers. The characteristic voltage is 0.16 mV at 50 K, which is remarkably improved compared to that of junctions without the planarization.

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Applied Superconductivity, IEEE Transactions on  (Volume:9 ,  Issue: 2 )