A trapped field of 17.6T in melt-processed, bulk Gd-Ba-Cu-O reinforced with shrink-fit steel
A trapped field of 17.6T in melt-processed, bulk Gd-Ba-Cu-O reinforced with shrink-fit steel
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DOI：
10.1088/0953-2048/27/8/082001
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发表时间：
2014-08-01
影响因子：
3.6
通讯作者：
Cardwell, D. A.
中科院分区：
文献类型：
--
作者：
Durrell, J. H.;Dennis, A. R.;Cardwell, D. A.
大晶粒（RE）Ba₂Cu₃O₇₋δ（（RE）BCO；RE = 稀土）块状超导体捕获磁场的能力由其临界电流决定。然而，在高捕获磁场下，块状样品会受到相对较大的洛伦兹力，并且其性能主要受其抗拉强度限制。因此，样品增强是这些具有重要技术意义的材料性能提升的关键。在这项工作中，我们报道了在两个直径为25毫米的掺银GdBCO超导块状样品堆叠中所达到的17.6 T的捕获磁场，这是迄今为止所报道的最大值。这些样品是通过顶部籽晶熔融生长法制备的，并采用热套不锈钢进行增强。这种样品制备技术具有实施相对简单且成本低廉的优点，并提供了无需持续电流源即可轻松获得便携式高磁场的可能性。
The ability of large-grain (RE)Ba2Cu3O7-delta ((RE)BCO; RE = rare earth) bulk superconductors to trap magnetic fields is determined by their critical current. With high trapped fields, however, bulk samples are subject to a relatively large Lorentz force, and their performance is limited primarily by their tensile strength. Consequently, sample reinforcement is the key to performance improvement in these technologically important materials. In this work, we report a trapped field of 17.6 T, the largest reported to date, in a stack of two silver-doped GdBCO superconducting bulk samples, each 25 mm in diameter, fabricated by top-seeded melt growth and reinforced with shrink-fit stainless steel. This sample preparation technique has the advantage of being relatively straightforward and inexpensive to implement, and offers the prospect of easy access to portable, high magnetic fields without any requirement for a sustaining current source.