Superconducting junctions and method of making same

Patent · Tue Jun 15 04:00:00 EDT 1993

OSTI ID:6184476

Kapituinik, A

A method of making Josephson junctions in high critical temperature superconductors is described comprising the consecutive steps of: first forming a layer of high Tc copper oxide superconductor on a substrate by forming the constituent components of the superconductor onto the substrate so as to epitaxially grow the superconductor on the substrate with copper-oxygen planes parallel to the surface of the substrate, said layer formed in a pattern to create a desired electronic circuit; then narrowing selected portions of the superconductor circuit at locations where Josephson junctions are desired; then creating weak link areas at said selected portions by moving an electrode across the surface of said selected portions, generally from one side of the selected portion to the other side of the selected portion, at a distance from the surface suitable to maintain a tunnel current between the electrode and the selected portion and maintaining said tunnel current directly into said junction locations while the electrode is proximate to the selected portions and sustaining said tunnel current through the electrodes long enough to physically remove superconducting material from the selected portion; and then depositing a noble metal in the selected portion by evaporating an electrode made from the noble metal.

• Assignee: Conductus, Inc., Sunnyvale, CA (United States)
• Patent Number(s): US 5219826; A
• Application Number: PPN: US 7-569434
• OSTI ID: 6184476
• Country of Publication: United States
• Language: English

Related Subjects

665412* -- Superconducting Devices-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
DEPOSITION
ELECTRODES
ELEMENTS
FABRICATION
HIGH-TC SUPERCONDUCTORS
JOSEPHSON JUNCTIONS
JUNCTIONS
METALS
OXIDES
OXYGEN COMPOUNDS
SUBSTRATES
SUPERCONDUCTING JUNCTIONS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
TUNNEL EFFECT