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Microscopic analysis of low-frequency flux noise in direct current superconducting quantum interference devices
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10.1063/1.1839273
/content/aip/journal/apl/85/24/10.1063/1.1839273
http://aip.metastore.ingenta.com/content/aip/journal/apl/85/24/10.1063/1.1839273
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) SQUID washer design; dotted line indicates grain boundary; (b) coupling strength vs radial distance from the slit [numerical calculation for design in (a)]. Inset: Magnetic flux coupled by a single vortex into the SQUID hole; numerical calculation for design in (a) (squares) and for a circular washer (disks); the line is obtained from analytical calculation (Ref. 8) for a circular washer; (c) images of the SQUID washer for two different cooling fields .

Image of FIG. 2.
FIG. 2.

rms flux noise of YBCO dc SQUID at showing Lorentzian noise due to a single dominating fluctuator (a) and low-frequency -noise (b). Inset: time trace of the SQUID output with a single dominating fluctuator.

Image of FIG. 3.
FIG. 3.

Sum of squared coupling strengths vs number of vortices . Dashed line: homogeneous vortex distribution. Inset: fraction of vortices found at a distance from the slit edge for different cooling fields .

Image of FIG. 4.
FIG. 4.

Spectral density of flux noise vs number of vortices . Dashed line: homogeneous vortex distribution. Inset: Average spectral density of radial motion vs , calculated from and .

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/content/aip/journal/apl/85/24/10.1063/1.1839273
2004-12-09
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Microscopic analysis of low-frequency flux noise in YBa2Cu3O7 direct current superconducting quantum interference devices
http://aip.metastore.ingenta.com/content/aip/journal/apl/85/24/10.1063/1.1839273
10.1063/1.1839273
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