DocumentCode
1070473
Title
The maximum zero-voltage tunnel current and its fluctuations for lead—lead oxide—lead Josephson tunnel junctions
Author
Gutmann, P.
Author_Institution
Physikalisch-Technische Bundesanstalt, Braunschweig, Germany
Volume
27
Issue
10
fYear
1980
fDate
10/1/1980 12:00:00 AM
Firstpage
2031
Lastpage
2033
Abstract
The maximum zero-voltage tunnel current I0 and its fluctuations were measured for Josephson tunnel junctions as a function of the normal state resistance 
in the range of 50-300 Ω at 
K. The junctions, based on pure lead, have areas of about 100 µm2, corresponding to capacitances 
of about 3 pF. The results obtained from a simple noise model, describing the junction in the zero-voltage state as a parallel resonant circuit with parameters 
, and , are in good agreement with the experiments. It is shown that the deviation of the experimental results for high-resistivity junctions from the theory of Ambegaokar and Baratoff is due to thermal noise currents originating in the normal state resistance .
in the range of 50-300 Ω at K. The junctions, based on pure lead, have areas of about 100 µm2, corresponding to capacitances of about 3 pF. The results obtained from a simple noise model, describing the junction in the zero-voltage state as a parallel resonant circuit with parameters , and , are in good agreement with the experiments. It is shown that the deviation of the experimental results for high-resistivity junctions from the theory of Ambegaokar and Baratoff is due to thermal noise currents originating in the normal state resistance .Keywords
Capacitance; Critical current; Current measurement; Fluctuations; Frequency; Hysteresis; Lead compounds; Superconducting device noise; Thermal resistance; Voltage;
fLanguage
English
Journal_Title
Electron Devices, IEEE Transactions on
Publisher
ieee
ISSN
0018-9383
Type
jour
DOI
10.1109/T-ED.1980.20142
Filename
1480935
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