YBCO DC SQUIDs utilizing sapphire step edge junctions

A number of superconducting quantum interference devices (SQUIDs) which utilize a step edge grain-boundary junction process on sapphire substrates have been measured. White noise levels of about 7 mu Phi /sub 0// square root Hz at 1 Hz in a 16-pH device at 77 K were measured. By modulating the bias...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 1993-03, Vol.3 (1), p.2457-2460
Main Authors: Berezin, A.B., Yuan, C.W., de Lozanne, A.L.
Format: Article
Language:English
Subjects:
Amplitude modulation
Applied sciences
Electronics
Exact sciences and technology
Interference
Josephson junctions
Low-frequency noise
Noise measurement
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
SQUIDs
Superconducting device noise
Superconducting devices
White noise
Yttrium barium copper oxide
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Summary:A number of superconducting quantum interference devices (SQUIDs) which utilize a step edge grain-boundary junction process on sapphire substrates have been measured. White noise levels of about 7 mu Phi /sub 0// square root Hz at 1 Hz in a 16-pH device at 77 K were measured. By modulating the bias current, only about a factor of 3 to 4 reduction in the amplitude of low-frequency noise is achieved. Excess flux noise is believed to constitute the remainder. A square washer configuration yields flux noise at 100 Hz at about 140 mu Phi /sub 0// square root Hz, giving a field sensitivity of 11 pT/ square root Hz. Measured hysteresis is about -1 to -5*10/sup -3/ in a low ambient field.< >
ISSN:1051-8223
1558-2515
DOI:10.1109/77.233953