Large transport critical currents of powder-in-tube Sr0.6K0.4Fe2As2/Ag superconducting wires and tapes
Large transport critical currents of powder-in-tube Sr0.6K0.4Fe2As2/Ag superconducting wires and tapes
复制标题
管内粉Sr0.6K0.4Fe2As2/Ag超导线材和带材的大传输临界电流
DOI：
10.1016/j.physc.2009.12.030
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发表时间：
2010-01-15
影响因子：
1.7
通讯作者：
Watanabe, Kazuo
中科院分区：
文献类型：
--
作者：
Wang, Lei;Qi, Yanpeng;Watanabe, Kazuo
我们报告了在T-c = 34 K的Sr0.6K0.4Fe2As2导线和带中实现传输临界电流。导线和胶带是通过管内原位粉末工艺制备的。银被用作化学添加剂和护套材料。所有的电线和胶带样品都显示出传输超导电流的能力。添加银后，临界电流密度J(c)得到提高，在4.2 K时，添加20%银的带达到了最大的J(c)，接近1200 a /cm(2) (I-c = 9 a)，这是迄今为止铁基导线和带中最高的。在1 T和10 T之间，J(c)几乎与场无关，表现出强烈的涡旋钉住。如此高的输运临界电流密度归因于银鞘与超导磁芯之间的弱反应，以及晶粒之间的连通性的改善。我们还从低场J(c)的明显下降和滞后现象中发现了弱链接行为。结果表明，与Fe、Ta和Nb管相比，Ag是制备高性能122型镍线和带的最佳护套材料。(C) 2009 Elsevier B.V.版权所有
We report the achievement of transport critical currents in Sr0.6K0.4Fe2As2 wires and tapes with a T-c = 34 K. The wires and tapes were fabricated through an in situ powder-in-tube process. Silver was used as a chemical addition as well as a sheath material. All the wire and tape samples have shown the ability to transport superconducting current. Critical current density J(c) was enhanced upon silver addition, and at 4.2 K, a largest J(c) of similar to 1200 A/cm(2) (I-c = 9 A) was achieved for 20% silver added tapes, which is the highest in iron-based wires and tapes so far. The J(c) is almost field independent between I T and 10 T, exhibiting a strong vortex pinning. Such a high transport critical current density is attributed to the weak reaction between the silver sheath and the superconducting core, as well as an improved connectivity between grains. We also identify a weak-link behavior from the apparent drop of J(c) at low fields and a hysteretic phenomenon. Finally, we found that compared to Fe, Ta and Nb tubes, Ag was the best sheath material for the fabrication of high-performance 122 type pnictide wires and tapes. (C) 2009 Elsevier B.V. All rights reserved.