High intrinsic noise and absence of hysteresis in superconducting quantum interference devices with large Steward-McCumber parameter

被引：18

作者：

Zeng, Jia ^{[1
,2
,3
,4
,5
]}

Zhang, Yi ^{[2
,3
,4
]}

Mueck, Michael ^{[6
]}

Krause, Hans-Joachim ^{[2
,3
,4
]}

Braginski, Alex I. ^{[2
]}

Kong, Xiangyan ^{[1
,3
,4
]}

Xie, Xiaoming ^{[1
,3
,4
]}

Offenhaeusser, Andreas ^{[2
,3
,4
]}

Jiang, Mianheng ^{[1
,3
,4
]}

机构：

[1] Chinese Acad Sci, State Key Lab Funct Mat Informat, SIMIT, Shanghai 200050, Peoples R China

[2] Forschungszentrum Julich, Peter Grunberg Inst PGI 8, D-52425 Julich, Germany

[3] Collaborat CAS Shanghai, Joint Res Lab Superconduct & Bioelect, Shanghai 200050, Peoples R China

[4] Forschungszentrum Julich, D-52425 Julich, Germany

[5] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

[6] Ez SQUID, D-35764 Sinn, Germany

来源：

APPLIED PHYSICS LETTERS | 2013年 / 103卷 / 04期

关键词：

DC-SQUID; OPTIMIZATION; MAGNETOMETER; ELECTRONICS; FEEDBACK; JUNCTION;

D O I：

10.1063/1.4816730

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We investigated niobium thin film superconducting quantum interference devices (SQUIDs) with large Steward-McCumber parameter (beta(c) > 1). No hysteresis was observed in the current-voltage (I-V) characteristics of the SQUIDs, even for beta(c) approximate to 17. We attribute the absence of hysteresis to an excess voltage noise of the junctions which increases the SQUID intrinsic noise delta Phi(s). It can be represented by an effective noise temperature T* of the SQUID which is higher than the bath temperature T. We simulated SQUID I-V characteristics using the measured device parameters and confirmed the absence of hysteresis. (C) 2013 AIP Publishing LLC.

引用

页数：3

共 15 条

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