ULTRA-SHORT WEAK LINKS OF SUPERCONDUCTORS.

被引：0

作者：

Ohta, Hiroshi ^{[1
]}

Yamada, Yasuharu ^{[1
]}

机构：

[1] Inst of Physical & Chemical, Research, Wako, Jpn, Inst of Physical & Chemical Research, Wako, Jpn

来源：

IEEE Transactions on Magnetics | 1984年 / MAG-21卷 / 02期

关键词：

LOGIC DEVICES - NIOBIUM AND ALLOYS;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Nanometer long weak links of quasi-planar geometrical structure have been made only of niobium. The critical current of an two-junction interferometer of the nanometer-long quasi-planar Josephson junctions (QPJJ) has been changed by a magnetic field to be one quarter of the zero-field critical current. This is important for applications of weak links to both DC SQUID and logic circuits. Microwave response of QPJJ's were excellent at 10,24, and 110 GHz. Change in the critical current of 10 mu A was less than 10% after 50 times temperature cycles between liquid helium temperature and room temperature. QRJJ's are very reproducibly fabricated by lithographic techniques even though surface of niobium thin films is very active chemically. New fluxoid-type logic circuits have been proposed which can be made of weak links rather than Josephson tunnel junctions.

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