Current-voltage characteristics of nanoampere Josephson junctions

Current-voltage characteristics of nanoampere Josephson junctions

We have studied the current-voltage characteristics of small area tunnel junctions at temperatures below 1 K. The junctions were made in an edge geometry with a Nb base electrode and had areas less than .05 μm 2 and critical currents in the nA range. Although the measured I-V characteristics resembl...

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Bibliographic Details
Published in:IEEE transactions on magnetics Vol. 23; no. 2; pp. 1670 - 1673
Main Authors: Ono, R., Cromar, M., Kautz, R., Soulen, R., Colwell, J., Fogle, W.
Format: Journal Article
Language:English
Published: IEEE 01-03-1987
Subjects:
Critical current
Current-voltage characteristics
Electrodes
Geometry
Hysteresis
Josephson junctions
Niobium
Temperature distribution
Tunneling
Voltage
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Summary:We have studied the current-voltage characteristics of small area tunnel junctions at temperatures below 1 K. The junctions were made in an edge geometry with a Nb base electrode and had areas less than .05 μm 2 and critical currents in the nA range. Although the measured I-V characteristics resemble those of ordinary hysteretic junctions, the supposed zero-voltage portion of the curve proved to have a finite slope and to deviate from zero voltage. For these junctions it is apparently possible for occasional 2π phase slips to occur without switching to the usual voltage state. This behavior can be explained either by macroscopic quantum tunneling or by a model in which the effective shunt conductance of the junction is frequency dependent.
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ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.1987.1064932