Low frequency noise of high-Tc radio-frequency SQUIDs based on grain boundary Josephson junctions

被引：4
|
作者：
Il'ichev, E
Krivoy, GS
IJsselsteijn, RPJ
机构：
[1] Inst Phys High Technol, Dept Cryoelect, D-07702 Jena, Germany
[2] FINO AG, D-31137 Hildesheim, Germany
来源：
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2002年 / 377卷 / 04期
关键词：
SQUID; Josephson junction;
D O I：
10.1016/S0921-4534(01)01314-4
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Noise properties of single-layer washer-type high-T-c YBa2Cu3O7-x rf SQUIDs with 30degrees grain boundary Josephson junctions have been investigated. We show experimentally that the additional low-frequency noise is produced by the magnetic flux dynamics in the "unwanted" junction in high-T-c rf SQUIDs which is formed by the grain boundary running through the washer of the SQUIDs on bicrystal substrates. In order to decrease the low-frequency noise we have designed rf SQUIDs with two strongly asymmetrical Josephson junctions. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：516 / 520
页数：5
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