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

doi:10.1143/JJAP.28.L1545

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 journal › Article › peer-review

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 language	English
Pages (from-to)	L1545-L1548
Journal	Japanese Journal of Applied Physics
Volume	28
Issue number	9 A
DOIs	https://doi.org/10.1143/JJAP.28.L1545
Publication status	Published - 1989 Sept 1
Externally published	Yes

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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10.1143/JJAP.28.L1545

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

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.",

keywords = "Ac-inductive method, Critical current density, Oxide superconductor, Quench-and-melt growth, Y-Ba-Cu-O",

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T1 - Critical current densities in superconducting Y-Ba-Cu-O prepared by the quench-and-melt growth technique

AU - Matsushita, Teruo

AU - Ni, Baorong

AU - Murakami, Masato

AU - Morita, Mitsuru

AU - Miyamoto, Katsuyoshi

AU - Saga, Makoto

AU - Matsuda, Shoichi

AU - Tanino, Mitsuru

PY - 1989/9/1

Y1 - 1989/9/1

N2 - 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.

AB - 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.

KW - Ac-inductive method

KW - Critical current density

KW - Oxide superconductor

KW - Quench-and-melt growth

KW - Y-Ba-Cu-O

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

Abstract

Keywords

ASJC Scopus subject areas

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