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

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Abstract

The critical current characteristic of 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 × 108 A/m2 at 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 × 1010 A/m2 under 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)1545-1548
Number of pages4
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume28
Issue number9
Publication statusPublished - 1989 Sep
Externally publishedYes

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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