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首页> 外文期刊>Physica, C. Superconductivity and its applications >Large transport critical currents of powder-in-tube Sr0.6K0.4Fe2As2/Ag superconducting wires and tapes
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Large transport critical currents of powder-in-tube Sr0.6K0.4Fe2As2/Ag superconducting wires and tapes

机译：管内粉末Sr0.6K0.4Fe2As2 / Ag超导线材和胶带的传输临界电流很大

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摘要

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.
机译：我们报告了在Sr0.6K0.4Fe2As2 T-c = 34 K的Sr0.6K0.4Fe2As2导线和带材中达到运输临界电流的情况。导线和带材是通过原位管内粉末工艺制造的。银被用作化学添加剂以及护套材料。所有电线和胶带样品均显示出能够传输超导电流的能力。添加银后，临界电流密度J（c）会增加，在4.2 K时，添加20％的银带会达到类似于1200 A / cm（2）（Ic = 9 A）的最大J（c）。是迄今为止铁基电线和胶带中最高的。 J（c）在I T和10 T之间几乎与场无关，表现出很强的涡旋钉扎。如此高的传输临界电流密度归因于银皮和超导芯之间的弱反应，以及晶粒之间的连通性提高。我们还从低场J（c）的明显下降和滞后现象中识别出弱链接行为。最后，我们发现，与Fe，Ta和Nb管相比，Ag是制造高性能122型磷化钨丝和带的最佳护套材料。

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