Superconductor technology: apparatus – material – process – Processes of producing or treating high temperature... – Producing josephson junction – per se
Patent
1993-12-22
1994-11-22
Hille, Rolf
Superconductor technology: apparatus, material, process
Processes of producing or treating high temperature...
Producing josephson junction, per se
505190, 505410, 505411, 505234, 257 33, 257 35, H01L 3922, H01B 1200, B05D 506, B05D 512
Patent
active
053669533
ABSTRACT:
A novel method of producing weak-link grain boundary Josephson junctions in high temperature superconducting thin films is disclosed. These junctions are reliably and reproducibly formed on uniform planar substrates (10) by the action of a seed layer (40) placed intermediate the substrate (10) and the superconductor film (20). The superconductor film (22) grown atop the seed (42) is misoriented from the rest of the film (24) by an angle between 5.degree. and 90.degree.. The grain boundary (30) so formed acts as a high quality weak-link junction for superconductor devices. The performance of these junctions can be improved by the addition of buffer layers (50, 60) between the substrate (10) and the superconductor film (20).
REFERENCES:
Char et al, "Extension of Bi-Epitaxial Josephson Junction Process to Various Substrates," Appl. Phys. Lett., vol. 59, No. 17, 21 Oct. 1991, pp. 2177-2179.
Char et al, "Bi-Epitaxial Grain Boundary Junctions in YBaCuO," Appl. Phys. Lett., vol. 59, No. 6, 5 Aug. 1991, pp. 733-735.
Char et al, "Grain Boundary Josephson Junctions Created by Bi-Epitaxial Processes," Physica C, vol. 185-189, PT. IV. Dec. 1991, pp. 2561-2562.
Eckstein et al, "BiSrCaCuO Thin Films by Atomically Layered Epitaxy," Appl. Phys. Lett., vol. 57, No. 10, 3 Sep. 1990, pp. 1049-1051.
Laibowitz et al, "All High Tc Edge Junctions and Squids," Appl. Phys. Lett., vol. 56, No. 7, 12 Feb. 1990, pp. 686-688.
Gross et al, "Low Noise YBaCuO Grain Boundary Junction DC Squid's," Appl. Phys. Lett., vol. 57, No. 7, 13 Aug. 1990, pp. 727-729.
Suzuki et al, "Josephson Effect and Small-Angle Grain Boundary in YBCO Thin Film Bridge," IEEE Trans. Mag., vol. 27, No. 2, Mar. 1991, pp. 3320-3323.
Char Kook-rin
Garrison Stephen M.
Newman Nathan
Zaharchuk Gregory G.
Conductus, Inc.
DeFranco Judith A.
Elcess Kimberley
Hille Rolf
Saadat Mahshid
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