Strain tolerant microfilamentary conductors of Bi sub 2 Sr sub 2 Ca sub 1 Cu sub 2 O sub 8 minus. delta

A highly strain tolerant family of conductors has been developed for the high-temperature superconductor Bi{sub 2}Sr{sub 2}Ca{sub 1}Cu{sub 2}O{sub 8{minus}{delta}} by fabricating a microfilamentary composite in which discontinuous filaments of the superconductors are separated from one another by ve...

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Bibliographic Details
Published in:Applied physics letters 1991-05, Vol.58:19
Main Authors: Miller, T.A., Ostenson, J.E., Li, Q., Schwartzkopf, L.A., Finnemore, D.K., Righi, J., Gleixner, R.A., Zeigler, D.
Format: Article
Language:English
Subjects:
360201 - Ceramics, Cermets, & Refractories- Preparation & Fabrication
360204 - Ceramics, Cermets, & Refractories- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
AMES LABORATORY
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
FABRICATION
FILAMENTS
MATERIALS SCIENCE
NATIONAL ORGANIZATIONS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RECRYSTALLIZATION
STRAINS
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
TRANSITION ELEMENT COMPOUNDS
US AEC
US DOE
US ERDA
US ORGANIZATIONS
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Summary:A highly strain tolerant family of conductors has been developed for the high-temperature superconductor Bi{sub 2}Sr{sub 2}Ca{sub 1}Cu{sub 2}O{sub 8{minus}{delta}} by fabricating a microfilamentary composite in which discontinuous filaments of the superconductors are separated from one another by very thin layers of Ag. The Ag provides a region of plastic flow and the strain tolerance. The Ag also provides barriers to supercurrent flow and to overcome these barriers, long slender filaments of Bi(2212) are arranged to have enormous overlap areas perpendicular to the direction of average current flow. This requires filament length to diameter ratios of about 10 000 to 1 and Ag barrier thicknesses on the order of 20 nm. This permits high {ital J}{sub {ital c}} values even though the sample has a dense array of barriers. At 4.2 K and 0.3 T, critical current densities typically fall smoothly from 1000 to 800 A/cm{sup 2} as the strain increases from 0 to 1.6%.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.104992