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 - 1987

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    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. (1987). Evidence for weak link and anisotropy limitations on the transport critical current in bulk polycrystalline Y1Ba2Cu3O x. Journal of Applied Physics, 62(12), 4821-4828. https://doi.org/10.1063/1.338985