NOISE PROPERTIES OF DIRECT-CURRENT SQUIDS WITH QUASIPLANAR YBA2CU3O7 JOSEPHSON-JUNCTIONS

被引：19

作者：

FALEY, MI ^{[1
]}

POPPE, U ^{[1
]}

URBAN, K ^{[1
]}

HILGENKAMP, H ^{[1
]}

HEMMES, H ^{[1
]}

AARNINK, W ^{[1
]}

FLOKSTRA, J ^{[1
]}

ROGALLA, H ^{[1
]}

机构：

[1] UNIV TWENTE, 7500 AE ENSCHEDE, NETHERLANDS

来源：

APPLIED PHYSICS LETTERS | 1995年 / 67卷 / 14期

关键词：

D O I：

10.1063/1.115087

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We describe the noise performance of dc SQUIDs fabricated with quasiplanar ramp-type Josephson junctions on the basis of c-axis-oriented YBa2Cu3O7/PrBa2Cu3O7 thin-film heterostructures. The noise spectrum of the de SQUIDs was measured with dc- and ac-bias schemes at different temperatures and showed values below 10(-5) Phi(0)/Hz(1/2) down to frequencies of about 1 Hz at 70 K. Up to now for the magnetic flux noise and the energy resolution obtained at 1 kHz and 77 K the best values were 2.5 X 10(-6), Phi(0)/Hz(1/2) and 3 X 10(-31) J/Hz, respectively. A study of the white and 1/f noises of the SQUIDs was performed. The influence of magnetic flux, bias current, high static magnetic fields, and aging on the SQUID noise were investigated. The junctions and devices do not degrade due to aging in air or thermal cycling. (C) 1995 American Institute of Physics.

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页码：2087 / 2089

页数：3

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