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

Journal Article · Mon May 13 04:00:00 EDT 1991 · Applied Physics Letters; (United States)

DOI:https://doi.org/10.1063/1.104992· OSTI ID:5563417

Miller, T A; Ostenson, J E; Li, Q; Schwartzkopf, L A; Finnemore, D K ^[1]; Righi, J; Gleixner, R A; Zeigler, D ^[2]

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1. Ames Laboratory, USDOE and Department of Physics, Iowa State University, Ames, Iowa 50011 (US A)
2. Babcock and Wilcox Research Center, Alliance, Ohio 44601 (USA)

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%.

• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5563417
• Journal Information: Applied Physics Letters; (United States), Journal Name: Applied Physics Letters; (United States) Vol. 58:19; ISSN APPLA; ISSN 0003-6951
• Country of Publication: United States
• Language: English

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