CHARACTERISTICS OF HIGH CRITICAL-CURRENT DENSITY JOSEPHSON-JUNCTIONS WITH NB/ALOX/NB TRILAYERS

被引：19

作者：

SUGIYAMA, H

FUJIMAKI, A

HAYAKAWA, H

机构：

[1] Department of Quantum Engineering, Nagoya University, Nagoya 464-01, Furo-cho, Chikusa-ku

来源：

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 1995年 / 5卷 / 02期

关键词：

D O I：

10.1109/77.403157

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We fabricated high critical current density (high Jc) Josephson junctions, up to 47 kA/cm(2), consisting of Nb/AlOx/Nb trialyers by use of high vacuum dc magnetron sputtering system (less than 10(-6) Pa). The relationship Jc proportional to(Pt)(-0.5) can be obtained up to 47 kA/cm(2), where P and t were pressure and time respectively in oxidizing an Al surface. In the high Jc junctions, microshorts existed in Al surfaces. A property peculiar to most of the high Jc junctions was a step appearing at 1/3 gap voltage on their I-V curves. Magnetic field dependence of this step was different from that of a Fiske step.

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页码：2739 / 2742

页数：4

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