Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1991-03-04
1993-03-23
Beck, Shrive
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
505702, 505728, 505701, 505732, 427 62, 427 63, 427309, 357 5, 156637, B05D 512, H01L 3922
Patent
active
051963957
ABSTRACT:
A method for generating repeatable and reproducible crystallographic grain-boundary junctions is provided by forming a film on a crystalline substrate which has intersecting faces. In a preferred embodiment, a single crystal substrate is etched by an anisotropic etchant to provide a "V"-groove in one face, and an epitaxial superconducting film is grown on the faces of the V-groove. In another preferred embodiment, a step is etched with an anisotropic etch, and an epitaxial superconducting film grown on the step. Grain-boundary junctions are formed at the points of intersection of the faces with each other, or with the faces and the surface of the substrate. The film may be patterned and etched in the area of the boundary junction to form useful devices.
REFERENCES:
patent: 4964945 (1990-10-01), Calhoun
patent: 4985117 (1991-01-01), Kurosawa et al.
Laibowitz et al, "All high edge junctions and SQUIDS" Appl. Phys Lett. 5617) Feb. 1990 pp. 686-688.
Tanabe et al, "Grain Boundary Jospehson Junctions Using Y-B.sub.a -C.sub.u -O films operative at 77K", Jpn. J. Appl. Phys. 26(12) Dec. 1987 pp. L1961-1963.
Daly, K. P. et al, "YBa2Cu307 Step-Edge RF Squid Biased at 10 GHz", IEEE Transaction on Magnetics, vol. 27, No. 2, Mar. 1991, pp.1-4.
Cui, G. J. et al, "Characterization of RF-Squids Fabricated From Epitaxial YBa2Cu307 Films", "Nonlinear Superconductive Electronics and Josephson Devices", Jan. 1991, Plenum Press, pp. 1-9.
Fleming Julia S.
James Timothy W.
Beck Shrive
King Roy V.
Superconductor Technologies Inc.
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