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YBa2Cu3O(7-delta)/Au/Nb sandwich geometry SNS weak links on c-axis oriented YBa2Cu3O(7-delta)Sandwich geometry superconductor/normal metal/superconductor structures have been fabricated on LaAlO3 and cubic zirconia with laser-ablated, c-axis-oriented YBa2Cu3O(7-delta) base electrodes, 100-600 A of Au, and Nb counter electrodes, all formed in situ without breaking vacuum. Junctions range in size from 5 to 50 micron on a side. Four probe I-V measurements at 4.2 K show RnA products as low as 6 x 10 to the -9th sq cm and critical current densities up to 5.2 kA/sq cm. AC Josephson steps were observed with the application of 10-GHz radiation. The temperature dependence of Jc and the observation of the AC Josephson effect suggest that true supercurrents are present and that they do indeed represent the characteristics of the YBa2Cu3O(7-delta)/Au/Nb structure. The best results were obtained when the devices were annealed at about 450 C in O2 for 30 min after Au deposition.
Document ID
19910051442
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Foote, M. C.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Hunt, B. D.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Bajuk, L. J.
(JPL Pasadena, CA, United States)
Date Acquired
August 15, 2013
Publication Date
March 1, 1991
Publication Information
Publication: IEEE Transactions on Magnetics
Volume: 27
ISSN: 0018-9464
Subject Category
Electronics And Electrical Engineering
Accession Number
91A36065
Distribution Limits
Public
Copyright
Other

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