NOISE PROPERTIES OF DC-SQUIDS ON Y1BA2CU3O7-X-THIN FILMS

被引：2
|
作者：
SIEGEL, M
SCHMIDL, F
ZACH, K
HEINZ, E
BORCK, J
MICHALKE, W
SEIDEL, P
机构：
[1] University Jena, Institute of Solid State Physics, O- 6900 Jena
[2] Institute of Solid State Physics, O- 6900 Jena
来源：
PHYSICA C | 1991年 / 180卷 / 1-4期
关键词：
D O I：
10.1016/0921-4534(91)90683-P
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
DC-SQUIDs based on Y1Ba2Cu3O7-X-thin films prepared by laser ablation and dc-magnetron sputtering, were investigated. The films exhibit transition temperatures of T(co) = 88K and critical current densities at T = 77K of j(c)(77K) = 10(6)Acm-2. The Josephson junctions were formed at a step on the MgO-substrate surface. The SQUID's were patterned with a focused Nd:YAG-laser beam. The properties of the thin film Josephson junctions were compared with RSJ-like grain boundary weak links, which have been investigated using the break junction method. The SQUID's show a clear flux modulation, the 1/f-noise intercept point was f = 10kHz. The following parameters of the SQUID's were obtained at T = 40K in the white noise region: a voltage-flux-transfer function of 20-mu-V/PHI-0, a flux resolution of 5.10(-6) PHI-0/Hz1/2, and an energy resolution of 6.10(-29)J/Hz with a SQUID-loop inductance of L = 30pH.
引用
收藏
页码：288 / 292
页数：5
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