Noise in DC SQUIDS with Nb/Al-oxide/Nb Josephson junctions

Noise in DC SQUIDS with Nb/Al-oxide/Nb Josephson junctions

The authors have developed a process which incorporates very-high-quality Nb/Al-oxide/Nb Josephson junctions. The junctions had low subgap conductance, yielding V/sub m/ greater than 50 mV for critical current densities of 1000 A/cm/sup 2/. Low-inductance SQUIDS (superconducting quantum interference...

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Bibliographic Details
Published in:IEEE transactions on magnetics Vol. 25; no. 2; pp. 1005 - 1007
Main Authors: Cromar, M.W., Beall, J.A., Go, D., Masarie, K.A., Ono, R.H., Simon, R.W.
Format: Journal Article
Language:English
Published: IEEE 01-03-1989
Subjects:
Critical current
Critical current density
Fluctuations
Frequency
Interference
Josephson junctions
Niobium
SQUIDs
Superconducting device noise
Superconducting devices
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Summary:The authors have developed a process which incorporates very-high-quality Nb/Al-oxide/Nb Josephson junctions. The junctions had low subgap conductance, yielding V/sub m/ greater than 50 mV for critical current densities of 1000 A/cm/sup 2/. Low-inductance SQUIDS (superconducting quantum interference devices) made with these junctions were apparently free from junction conductance fluctuations, at least for frequencies above 1 Hz. A correlation between low leakage junctions and low noise from critical current fluctuations was observed. The SQUIDS exhibited flux noise with an unusual frequency dependence of currently unknown origin.< >
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ISSN:0018-9464
1941-0069
DOI:10.1109/20.92458