Patent US6383989B2 successfully refreshed from Google Patents.
US6383989B2
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Architecture for high critical current superconducting tapes
Assignee: University of California
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Filing: 2001-05-29
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Granted: 2002-05-07
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Expires: 2021-05-29
Abstract
Abstract Improvements in critical current capacity for superconducting film structures are disclosed and include the use of, e.g., multilayer YBCO structures where individual YBCO layers are separated by a layer of an insulating material such as CeO 2 and the like, a layer of a conducting material such as strontium ruthenium oxide and the like or by a second superconducting material such as SmBCO and the like.
Inventors
- 👤 Quanxi Jia
- 👤 Stephen R. Foltyn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:43
CPC Classifications
H; H10; H10N; H10N60/00; H10N60/20; H10N60/203; H10N60/80; H10N60/85; H10N60/855; H10N60/857; H10N60/858
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
171 words
A superconducting structure comprising: a metallic substrate; and, a film of a superconducting rare-earth-barium-copper oxide upon said substrate, said film comprising a composite multilayer structure of a first layer of a superconducting rare-earth-barium-copper oxide from about 0.2 microns to about 2 microns in thickness, a layer of an insulating material selected from the group consisting of cerium oxide, strontium titanate, yttrium oxide, magnesium oxide, and yttria-stabilized zirconia, or of a conducting material selected from the group consisting of lanthanum strontium cobalt oxide and strontium ruthenium oxide, and a second layer of a superconducting rare-earth-barium-copper oxide from about 0.2 microns to about 2 microns in thickness, said superconducting structure characterized as having a total combined thickness of superconducting rare-earth-barium-copper oxide layers of at least 2 microns and characterized as having a critical current for said composite multilayer structure greater than a critical current for a single superconducting rare-earth-barium-copper oxide layer of at least 2 microns in thickness, said single superconducting rare-earth-barium-copper oxide layer including the same rare-earth as the composite multilayer structure.
Claim 2
Dependent Claim
171 words
A superconducting structure comprising: a metallic substrate; and, a film of a superconducting rare-earth-barium-copper oxide upon said substrate, said film comprising a composite multilayer structure of a first layer of a superconducting rare-earth-barium-copper oxide from about 0.2 microns to about 2 microns in thickness, a layer of an insulating material selected from the group consisting of cerium oxide, strontium titanate, yttrium oxide, magnesium oxide, and yttria-stabilized zirconia, or of a conducting material selected from the group consisting of lanthanum strontium cobalt oxide and strontium ruthenium oxide, and a second layer of a superconducting rare-earth-barium-copper oxide from about 0.2 microns to about 2 microns in thickness, said superconducting structure characterized as having a total combined thickness of superconducting rare-earth-barium-copper oxide layers of at least 2 microns and characterized as having a critical current for said composite multilayer structure greater than a critical current for a single superconducting rare-earth-barium-copper oxide layer of at least 2 microns in thickness, said single superconducting rare-earth-barium-copper oxide layer including the same rare-earth as the composite multilayer structure.
Claim 3
Dependent Claim
19 words
The structure of claim 1 wherein said insulating layer is from about 25 nm to about 100 in thickness.
Claim 4
Dependent Claim
20 words
The structure of claim 1 wherein said insulating layer is from about 40 nm to about 60 nm in thickness.
Claim 5
Dependent Claim
66 words
The structure of claim 1 including further alternating layers of: (a) an insulating material selected from the group consisting of cerium oxide, strontium titanate, yttrium oxide, magnesium oxide, and yttria-stabilized zirconia, or of a conducting material selected from the group consisting of lanthanum strontium cobalt oxide and strontium ruthenium oxide; and, (b) a superconducting rare-earth-barium-copper oxide from about 0.2 microns to about 2 microns in thickness.
Claim 6
Dependent Claim
22 words
The structure of claim 1 wherein said rare-earth-barium-copper oxide in said first superconducting layer and said second superconducting layer is yttrium-barium-copper oxide.
Claim 7
Dependent Claim
31 words
The structure of claim 1 wherein said rare-earth-barium-copper oxide in said first superconducting layer is yttrium-barium-copper oxide and the rare-earth-barium-copper oxide in said second superconducting layer is other than yttrium-barium-copper oxide.
Claim 8
Dependent Claim
38 words
The structure of claim 1 wherein said rare-earth-barium-copper oxide in at least one of said first superconducting layer and said second superconducting layer includes a mixture of at least a first rare-earth-barium-copper oxide and a second rare-earth-barium-copper oxide.
References Cited (Backward Citations)
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