Characteristics of YBa2Cu3O7_δ Grain Boundary Junction DC-Squids

R. Gross; M. Kawasaki; M. B. Ketchen; A. Gupta

doi:10.1109/20.133990

Characteristics of YBa2Cu3O7_δ Grain Boundary Junction DC-Squids

R. Gross, M. Kawasaki, M. B. Ketchen, A. Gupta

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21 Scopus citations

Abstract

We report on the characteristics of YBa2Cu307_δ grain boundary junction (GBJ) dc-SQUIDs with a square washer geometry design. The current-voltage characteristics of these SQUIDs are close to those predicted by the resistively shunted junction (RSJ) model. Their flux-voltage characteristics are perfectly periodic from 4.2 to 87K. The noise characteristics have been measured as a function of frequency, temperature, bias current, and applied magnetic flux. At frequencies above about 1kHz kHz the magnetic flux noise energy of the GBJ-SQUIDs is frequency independent and close to the theoretical value estimated from the Nyquist noise in the junction normal resistance. At lower frequencies the noise scales approximately as 1/f. Above about 82-85K the 1/f noise is dominated by flux noise presumably caused by thermally assisted flux motion in the film. Below this temperature it is dominated by voltage noise across the junctions.

Original language	English
Pages (from-to)	2565-2568
Number of pages	4
Journal	IEEE Transactions on Magnetics
Volume	27
Issue number	2
DOIs	https://doi.org/10.1109/20.133990
State	Published - Mar 1991
Externally published	Yes

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title = "Characteristics of YBa2Cu3O7_δ Grain Boundary Junction DC-Squids",

abstract = "We report on the characteristics of YBa2Cu307_δ grain boundary junction (GBJ) dc-SQUIDs with a square washer geometry design. The current-voltage characteristics of these SQUIDs are close to those predicted by the resistively shunted junction (RSJ) model. Their flux-voltage characteristics are perfectly periodic from 4.2 to 87K. The noise characteristics have been measured as a function of frequency, temperature, bias current, and applied magnetic flux. At frequencies above about 1kHz kHz the magnetic flux noise energy of the GBJ-SQUIDs is frequency independent and close to the theoretical value estimated from the Nyquist noise in the junction normal resistance. At lower frequencies the noise scales approximately as 1/f. Above about 82-85K the 1/f noise is dominated by flux noise presumably caused by thermally assisted flux motion in the film. Below this temperature it is dominated by voltage noise across the junctions.",

author = "R. Gross and M. Kawasaki and Ketchen, {M. B.} and A. Gupta",

year = "1991",

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language = "English",

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pages = "2565--2568",

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T1 - Characteristics of YBa2Cu3O7_δ Grain Boundary Junction DC-Squids

AU - Gross, R.

AU - Kawasaki, M.

AU - Ketchen, M. B.

AU - Gupta, A.

PY - 1991/3

Y1 - 1991/3

N2 - We report on the characteristics of YBa2Cu307_δ grain boundary junction (GBJ) dc-SQUIDs with a square washer geometry design. The current-voltage characteristics of these SQUIDs are close to those predicted by the resistively shunted junction (RSJ) model. Their flux-voltage characteristics are perfectly periodic from 4.2 to 87K. The noise characteristics have been measured as a function of frequency, temperature, bias current, and applied magnetic flux. At frequencies above about 1kHz kHz the magnetic flux noise energy of the GBJ-SQUIDs is frequency independent and close to the theoretical value estimated from the Nyquist noise in the junction normal resistance. At lower frequencies the noise scales approximately as 1/f. Above about 82-85K the 1/f noise is dominated by flux noise presumably caused by thermally assisted flux motion in the film. Below this temperature it is dominated by voltage noise across the junctions.

AB - We report on the characteristics of YBa2Cu307_δ grain boundary junction (GBJ) dc-SQUIDs with a square washer geometry design. The current-voltage characteristics of these SQUIDs are close to those predicted by the resistively shunted junction (RSJ) model. Their flux-voltage characteristics are perfectly periodic from 4.2 to 87K. The noise characteristics have been measured as a function of frequency, temperature, bias current, and applied magnetic flux. At frequencies above about 1kHz kHz the magnetic flux noise energy of the GBJ-SQUIDs is frequency independent and close to the theoretical value estimated from the Nyquist noise in the junction normal resistance. At lower frequencies the noise scales approximately as 1/f. Above about 82-85K the 1/f noise is dominated by flux noise presumably caused by thermally assisted flux motion in the film. Below this temperature it is dominated by voltage noise across the junctions.

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Characteristics of YBa2Cu3O7_δ Grain Boundary Junction DC-Squids

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