Influence of grain boundary connectivity on the trapped magnetic flux of multi-seeded bulk superconductors

被引：6
|
作者：
Deng, Z. [1 ]
Miki, M. [1 ]
Felder, B. [1 ]
Tsuzuki, K. [1 ]
Shinohara, N. [1 ]
Hara, S. [1 ]
Uetake, T. [1 ]
Izumi, M. [1 ]
机构：
[1] Tokyo Univ Marine Sci & Technol, Dept Marine Elect & Mech Engn, Appl Phys Lab, Tokyo 1358533, Japan
来源：
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2011年 / 471卷 / 17-18期
基金：
日本学术振兴会;
关键词：
Bulk high-temperature superconductors; Grain boundaries; Multi-seeded bulks; Trapped magnetic flux; CU-O SUPERCONDUCTOR; MELT GROWTH; YBCO SUPERCONDUCTORS; FIELD;
D O I：
10.1016/j.physc.2011.06.001
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The top-seeded melt-growth process with multi-seeding technique provides a promising way to fabricate large-sized bulk superconductors in an economical way. To understand the essential characteristics of the multi-seeded bulks, the paper reports the influence of the grain boundary (GB) coupling or connectivity on the total trapped magnetic flux. The coupling ratio, the lowest trapped flux density in the GB area to the averaged top value of the two neighboring peak trapped fields, is introduced to reflect the coupling quality of GBs inside a multi-seeded bulk. By the trapped flux density measurement of four different performance multi-seeded YBCO bulk samples as representatives, it was found that the GB coupling plays an important role for the improvement of the total trapped magnetic flux; moreover, somewhat more significant than the widely used parameter of the peak trapped fields to evaluate the physical performance of bulk samples. This characteristic is different with the case of the well-grown single-grain bulks. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码：504 / 508
页数：5
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