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Practical high T sub c Josephson junctions and dc SQUIDs operating above 85 K

Journal Article · · Applied Physics Letters; (USA)
DOI:https://doi.org/10.1063/1.105231· OSTI ID:5806041
; ; ; ;  [1]
  1. Biomagnetic Technologies, Inc., 9727 Pacific Heights Boulevard, San Diego, California 92121 (US)
Reproducible high {ital T}{sub {ital c}} YBa{sub 2}Cu{sub 3}O{sub 7}/Ag/YBa{sub 2}Cu{sub 3}O{sub 7} Josephson junctions have been fabricated using an entirely {ital in} {ital situ} step-edge technique. The junction process requires the deposition of a single high {ital T}{sub {ital c}} film and the patterning is performed using standard photolithography and ion-beam etching. The junctions exhibit a well-defined supercurrent from 4.2 to 87 K and the ac Josephson effect is observed up to 80 K in response to microwave radiation. dc SQUIDs have been fabricated and show the expected periodic modulation of the critical current in a magnetic field at temperatures ranging from 4.2 to 85.7 K. All of the 56 devices fabricated and measured to date show a well-defined supercurrent from 4.2 to over 77 K.
OSTI ID:
5806041
Journal Information:
Applied Physics Letters; (USA), Journal Name: Applied Physics Letters; (USA) Vol. 58:22; ISSN APPLA; ISSN 0003-6951
Country of Publication:
United States
Language:
English