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

页码：288 / 292

页数：5

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