Superconductor technology: apparatus – material – process – High temperature devices – systems – apparatus – com- ponents,... – Josephson junction – per se or josephson junction with only...
Patent
1995-06-05
1997-03-18
Jackson, Jr., Jerome
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
056122900
ABSTRACT:
A Josephson junction device is disclosed that includes a single crystalline substrate having a NaCl type crystal structure. The device includes a principal surface having two horizontal planes and a slope inclined at an angle of 5.degree. to 30.degree. between the two horizontal planes. An oxide superconductor thin film is formed on the principal surface of the substrate, which includes first and a second superconducting portions of a first single crystalline oxide superconductor and a second single crystalline oxide superconductor respectively positioned on the two horizontal planes of the substrate. A junction portion of a single crystalline oxide superconductor has a different crystal orientation from the first and the second superconducting portions, and is positioned on the slope of the substrate. Two grain boundaries between each of the first and the second superconducting portions and the junction portion constitute one weak link of the Josephson junction.
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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 Epitoxial YBa.sub.2 Ca.sub.3 O.sub.7 Films on Step-Edge Sr Ti O.sub.3 Substrate", Physica. C., vol. 175, 1991, pp. 545-554.
Luine et al., "Characteristics of High Performance YBa.sub.2 Ca.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
Jackson, Jr. Jerome
Sumitomo Electric Industries Ltd.
Tang Alice W.
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