FABRICATION OF SUPERCONDUCTING QUANTUM INTERFERENCE DEVICE WITH THIN-FILM QUANTUM POINT CONTACTS

被引：3
|
作者：
ABE, H
HAMASAKI, K
ISHIGURO, T
机构：
[1] Department of Electrical Engineering, Nagaoka University of Technology, Nagaoka, Niigata
来源：
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS | 1994年 / 33卷 / 12B期
关键词：
ALL-THIN-FILM POINT CONTACT; BTK THEORY; DC-SQUID; FLUX NOISE;
D O I：
10.1143/JJAP.33.7210
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We have fabricated de-superconducting quantum interference devices (SQUIDs) with all-thin-film point contacts (Nb-Nb nanoconstriction-NbN). The size of the nanoconstriction may be smaller than the superconducting coherence length of bulk Nb. The quasiparticle characteristic of the all-thin-film point contact can be explained using the Blonder, Tinkham and Klapwijk (BTK) quasiparticle current which is applicable to the superconducting quantum point contact. The flux noise of SQUID with 10 pH operated in a flux locked loop is 8 mu Phi(0)/Hz(1/2) at 1 Hz, and 4 mu Phi(0)/Hz(1/2) at frequencies above 10 Hz is limited by the preampiifier.
引用
收藏
页码：7210 / 7213
页数：4
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