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Interface-engineered Josephson junctions optimized for high JC

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4 Author(s)
Shimakage, H. ; Commun. Res. Lab., Kansai Adv. Res. Centre, Kobe, Japan ; Ono, Ronald H. ; Vale, L.R. ; Zhen Wang

High-temperature superconducting interface-engineered junctions were fabricated using YBa2Cu3O7-δ on LaAlO3 (LAO) and sapphire substrates. We report on the improvements in the electrical characteristics by junction narrowing. Originally, the 2-μm-wide junctions had high critical current densities of 1.2 × 106 A/cm at 4.0 K and showed wide junction effects. Narrowing the junctions to below a micrometer reduced the wide junction effect over a large range of temperatures and the junctions had characteristic voltages of 5.16 mV at 4.0 K. The magnetic-field modulation of the critical current was also more ideal after narrowing. Furthermore, we show that interface engineered junctions on sapphire substrates have similar characteristics to those on LAO

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:11 ,  Issue: 2 )