Fabrication and characterisation of series YBCO step-edge Josephson junction arrays

Fabrication and characterisation of YBCO step-edge Josephson junction arrays in a series configuration are reported. The junction arrays were fabricated using CSIRO YBCO step-edge junction technology, which, owing to the flexibility of locating the junctions anywhere on the chip, makes it very attra...

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Bibliographic Details
Published in:Superconductor science & technology 2014-09, Vol.27 (9), p.95005-7
Main Authors: Du, J, Lazar, J Y, Lam, S K H, Mitchell, E E, Foley, C P
Format: Article
Language:English
Subjects:
Arrays
COPPER OXIDE
Electrical junctions
FABRICATION
high temperature superconductor
Josephson junction array
Josephson junctions
Spreads
step-edge junction
Superconductor junctions
SUPERCONDUCTORS
Volt-ampere characteristics
YBCO superconductors
YTTRIUM OXIDE
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Summary:Fabrication and characterisation of YBCO step-edge Josephson junction arrays in a series configuration are reported. The junction arrays were fabricated using CSIRO YBCO step-edge junction technology, which, owing to the flexibility of locating the junctions anywhere on the chip, makes it very attractive for implementation of multiple HTS devices and circuits. Arrays of 50 junctions in series were fabricated, and the DC current-voltage (I-V) characterisations were studied at temperatures ranging from 15 to 77 K; temperatures were obtained via either placing the samples in the vent gas of a liquid He cryostat or use of a commercial cryocooler. Eight fabricated and tested arrays, totalling 400 junctions, showed no electrically open or shorted junctions (i.e., a 100% yield of working Josephson junctions), demonstrating good fabrication reliability. Large junction normal resistances (several hundred s) were obtained from the series junction arrays, making them suitable for a range of high-frequency applications. A study of the junction critical current spread within an array, magnetic field dependence of the critical current, and microwave responses of the arrays is also described.
ISSN:0953-2048
1361-6668
DOI:10.1088/0953-2048/27/9/095005