Superconductor technology: apparatus – material – process – High temperature devices – systems – apparatus – com- ponents,... – Josephson junction – per se or josephson junction with only...
Patent
1993-05-28
1995-06-06
Larkins, William D.
Superconductor technology: apparatus, material, process
High temperature devices, systems, apparatus, com- ponents,...
Josephson junction, per se or josephson junction with only...
505234, 505239, 505329, 505701, 505702, 257 33, 257 34, 257 31, H01L 3922, H01L 3900, H01L 2700
Patent
active
054223377
ABSTRACT:
A Josephson junction device comprising a single crystalline substrate including a principal surface having two horizontal planes and a smooth slope between the two horizontal planes, and an oxide superconductor thin film formed on the principal surface of the substrate. The oxide superconductor thin film includes a first and a second superconducting portions of a single crystalline oxide superconductor respectively positioned on the two horizontal planes of the substrate, a junction portion of a single crystalline oxide superconductor having a different crystal orientation from the two superconducting portions positioned on the slope of the substrate and two grain boundaries between each of the two superconducting portions and the junction portion. The grain boundaries constitutes one weak link of the Josephson junction.
REFERENCES:
patent: 5077266 (1991-12-01), Takagi et al.
G. Friedl et al., "Transport Properties of epitaxial YBa.sub.2 CU.sub.3 O.sub.x films at step edges, Applied Physics Letters:" 50 vol. 59, No. 21, 18 Nov. 1991, New York US pp. 2751-2753.
J. S. Martens et al., "Tl-Ca-Ba-Cu-O step-edge Josephson junctions", Applied Physics Letters vol. 60, No. 9, 2 Mar. 1992, New York US, pp. 1141-1143.
R. B. Laibowitz et al., "All High T.sub.c edge junctions and SQUIDs", Applied Physics Letters, vol. 56 No. 7, 12 Feb. 1990, New York US pp. 686-688.
K. P. Daly, "Substrate step-edge YBA.sub.2 Cu.sub.3 O.sub.7 ", Applied Physics Letters, 4 Feb. 1991, New York US, pp. 543-545.
Jia et al., "Microstructure of Epitaxial YBa.sub.2 Cu.sub.3 O.sub.7 Films on Step-Edges SrTiO.sub.3 Substrate", Physica C, vol. 175, 1991, pp. 545-554.
Luine et al., "Characteristics of High Performance YB.sub.a2 Cu.sub.3 O.sub.7 Step-Edge Junctions", Appl. Phys. Lett. vol. 61, No. 9, Aug. 31, 1992, pp. 1128-1130.
Itozaki Hideo
Matsuura Takashi
Tanaka Saburo
Larkins William D.
Sumitomo Electric Industries
Tang Alice W.
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