TY - JOUR
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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U2 - 10.1143/JJAP.28.L1545
DO - 10.1143/JJAP.28.L1545
M3 - Article
AN - SCOPUS:0024733628
SN - 0021-4922
VL - 28
SP - L1545-L1548
JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
IS - 9 A
ER -