High critical current density and low anisotropy in textured Sr₁-xKxFe₂As₂ tapes for high field applications.

High critical current density and low anisotropy in textured Sr₁-xKxFe₂As₂ tapes for high field applications.
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DOI:
10.1038/srep00998
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发表时间:
2012
期刊:
影响因子:
4.6
通讯作者:
Watanabe, Kazuo
Watanabe, Kazuo
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Gao, Zhaoshun;Ma, Yanwei;Yao, Chao;Zhang, Xianping;Wang, Chunlei;Wang, Dongliang;Awaji, Satoshi;Watanabe, Kazuo

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From the application point of view, large critical current densities Jc (H) for superconducting wires are required, preferably for magnetic fields higher than 5 T. Here we show that strong c-axis textured Sr1−xKxFe2As2 tapes with nearly isotropic transport Jc were fabricated by an ex-situ powder-in-tube (PIT) process. At 4.2 K, the Jc values show extremely weak magnetic field dependence and reach high values of 1.7×104 A/cm2 at 10 T and 1.4×104 A/cm2 at 14 T, respectively, these values are by far the highest ever reported for iron based wires and approach the Jc level desired for practical applications. Transmission electron microscopy investigations revealed that amorphous oxide layers at grain boundaries were significantly reduced by Sn addition which resulted in greatly improved intergranular connectivity. Our results demonstrated the strong potential of using iron based superconductors for high field applications.
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