Evidence for weak link and anisotropy limitations on the transport critical current in bulk polycrystalline Y1Ba2Cu3O x

J. W. Ekin, A. I. Braginski, A. J. Panson, M. A. Janocko, D. W. Capone, N. J. Zaluzec, B. Flandermeyer, O. F. De Lima, M. Hong, J. Kwo, S. H. Liou

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Abstract

Measurements of the transport critical-current density (Jc), magnetization Jc, and magnetoresistance in a number of bulk sintered samples of Y1Ba2Cu3Ox from several different laboratories indicate that the transport Jc is limited by weak-link regions between high Jc regions. The weak-link J c has a Josephson character, decreasing by two orders of magnitude as the magnetic field is increased from 0.1 to 10 mT at 77 K. An examination of the grain-boundary region in Y1Ba2Cu3O x shows no observable impurities or second phases to the scale of the [001] lattice planes (∼12 Å). The effect of intrinsic conduction anisotropy is discussed. A current-transfer model is proposed in which weak conduction along the c axis plays a role in limiting Jc at grain boundaries. Orienting the grains in the powder state during processing may result in enhanced transport Jc in bulk conductors.

Original languageEnglish (US)
Pages (from-to)4821-4828
Number of pages8
JournalJournal of Applied Physics
Volume62
Issue number12
DOIs
StatePublished - Dec 1 1987

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critical current
grain boundaries
conduction
anisotropy
conductors
examination
current density
impurities
magnetization
magnetic fields

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Evidence for weak link and anisotropy limitations on the transport critical current in bulk polycrystalline Y1Ba2Cu3O x. / Ekin, J. W.; Braginski, A. I.; Panson, A. J.; Janocko, M. A.; Capone, D. W.; Zaluzec, N. J.; Flandermeyer, B.; De Lima, O. F.; Hong, M.; Kwo, J.; Liou, S. H.

In: Journal of Applied Physics, Vol. 62, No. 12, 01.12.1987, p. 4821-4828.

Research output: Contribution to journalArticle

Ekin, JW, Braginski, AI, Panson, AJ, Janocko, MA, Capone, DW, Zaluzec, NJ, Flandermeyer, B, De Lima, OF, Hong, M, Kwo, J & Liou, SH 1987, 'Evidence for weak link and anisotropy limitations on the transport critical current in bulk polycrystalline Y1Ba2Cu3O x', Journal of Applied Physics, vol. 62, no. 12, pp. 4821-4828. https://doi.org/10.1063/1.338985
Ekin, J. W. ; Braginski, A. I. ; Panson, A. J. ; Janocko, M. A. ; Capone, D. W. ; Zaluzec, N. J. ; Flandermeyer, B. ; De Lima, O. F. ; Hong, M. ; Kwo, J. ; Liou, S. H. / Evidence for weak link and anisotropy limitations on the transport critical current in bulk polycrystalline Y1Ba2Cu3O x. In: Journal of Applied Physics. 1987 ; Vol. 62, No. 12. pp. 4821-4828.
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AU - Janocko, M. A.

AU - Capone, D. W.

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AU - Flandermeyer, B.

AU - De Lima, O. F.

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AU - Liou, S. H.

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