Critical current densities in superconducting Y-Ba-Cu-O prepared by the quench-and-melt growth technique

Teruo Matsushita, Baorong Ni, Masato Murakami, Mitsuru Morita, Katsuyoshi Miyamoto, Makoto Saga, Shoichi Matsuda, Mitsuru Tanino

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The critical current characteristic of a Y-Ba-Cu-O specimen prepared by the quench-and-melt growth (QMG) technique was investigated by the ac-inductive method. It was found that there were two kinds of currents. The bulk critical current density is 1.0×108A/m2at 77 K and 0.12 T. This value is comparable to a previous estimate from dc-magnetization measurements. The local current density amounts to 3.2×1010A/m2under the same conditions. Appearance of two kinds of currents seems to be caused by nonsuperconducting second-phase layers formed along the direction of grain growth, which disturb uniform current.

Original languageEnglish
Pages (from-to)L1545-L1548
JournalJapanese Journal of Applied Physics
Volume28
Issue number9 A
DOIs
Publication statusPublished - 1989 Sep 1

Keywords

  • Ac-inductive method
  • Critical current density
  • Oxide superconductor
  • Quench-and-melt growth
  • Y-Ba-Cu-O

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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