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US 6,383,989 B2Granted
Architecture for high critical current superconducting tapes
AssigneeThe Regents of the University of California
InventorsQuanxi Jia, Stephen R. Foltyn
Life of this patent
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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 CeO2 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.
Claims7
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.
Dependencies are inferred from the claim text.