Experimental determination of two-dimensional critical current density distribution in YBCO coated conductors

被引:32
作者
Amemiya, N
Shinkai, Y
Iijima, Y
Kakimoto, K
Takeda, K
机构
[1] Yokohama Natl Univ, Fac Engn, Yokohama, Kanagawa 2408501, Japan
[2] Fujikura Ltd, Mat Res Lab, Tokyo 1358512, Japan
关键词
D O I
10.1088/0953-2048/14/8/317
中图分类号
O59 [应用物理学];
学科分类号
摘要
The critical current density (J(c)) distribution in YBCO coated conductors is attracting interest from the viewpoint of its influence on their AC loss characteristics as well as from material science and process engineering. A two-dimensional J(c) distribution in a YBCO coated conductor made by the MAD (ion-beam assisted deposition) and the PLD (pulse-laser deposition) method can be determined by the magnetic-knife method with spatial resolutions of 0.2 mm lateral and 10 mm longitudinal directions, respectively. In an up-to-date 80A-class YBCO coated conductor, the J(c) is relatively uniform in the central part and reaches 7 x 10(9) A m(-2), while the J(c) fluctuates spatially in the central part of a tape fabricated earlier and with less critical current. Near the edges of the tapes, the J(c) is higher or lower than in the central part and the experimentally determined J(c) distributions are far from uniform. This suggests that a presumption of a uniform J(c) for AC loss estimations is not always reasonable and can lead to a large error in the estimated AC losses.
引用
收藏
页码:611 / 617
页数:7
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