Abstract:In this paper, we describe the fabrication of low leakage Superconductor/Insulator/Superconductor (SIS) junctions with a Nb/Al/AlO x /Al/Nb structure. In other words, an extra Al layer was added onto the top of the insulator in a conventional Nb/Al/AlO x /Nb junction. We measured the current and voltage (IV) characteristics of both the Nb/Al/AlO x /Al/Nb and Nb/Al/AlO x /Nb junctions at the temperature of liquid helium, and found that the sub-gap leakage current in the Nb/Al/AlO x /Al/Nb junctions was much low… Show more
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