LOW 1/F NOISE SINGLE-LAYER YBA2CU3OX DC SQUID AT 77 K

被引：54

作者：

FRIEDL, G ^{[1
]}

VILDIC, M ^{[1
]}

ROAS, B ^{[1
]}

UHL, D ^{[1
]}

BOMMEL, F ^{[1
]}

ROMHELD, M ^{[1
]}

HILLENBRAND, B ^{[1
]}

STRITZKER, B ^{[1
]}

DAALMANS, G ^{[1
]}

机构：

[1] SIEMENS AG,W-8520 ERLANGEN,GERMANY

来源：

APPLIED PHYSICS LETTERS | 1992年 / 60卷 / 24期

关键词：

D O I：

10.1063/1.106752

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Autonomous single-layer dc superconducting quantum interference devices (SQUIDs) have been prepared from epitaxial, laser-deposited YBa2Cu3Ox films on step edge SrTiO3 and LaAlO3 substrates. For device patterning, a SiO(x) inhibit technique as well as conventional ethylenediaminetetraacetic wet etch was used. The Josephson junctions are of grain boundary type. Their widths are 5-mu-m. The SQUID hole is a square of about 5-mu-m; the SQUID inductance is estimated to be about 20 pH. We obtained a very regular, nonhysteretic flux to voltage modulation over more than 100 flux quanta (PHI-0). The maximum voltage signal is of the order of 15-mu-V peak to peak and the maximum transfer function dV/d-PHI at the appropriate flux bias is 50-mu-V/PHI-0 at 77 K. The best value of the equivalent flux noise as measured in the flux locked loop mode is 1.4X10(-5) PHI-0/Hz1/2 at 1 Hz and 1X10(-5) PHI-0/Hz1/2 in the white noise region for f>5 Hz. This results in an energy resolution epsilon(n,w)(f>5 Hz)=1X10(-29) J/Hz in the white noise region and 2X10(-29) J/Hz at 1 Hz.

引用

页码：3048 / 3050

页数：3

共 16 条

[1]

CHAR K, 1991, PHYS REV LETT, V59, P733

[2] DIRECT MEASUREMENT OF THE SUPERCONDUCTING PROPERTIES OF SINGLE GRAIN-BOUNDARIES IN Y1BA2CU3O7-DELTA [J].