文章基本信息

标题：Strongly enhanced current densities in Sr0.6K0.4Fe2As2 + Sn superconducting tapes
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作者：He Lin ; Chao Yao ; Xianping Zhang 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：4
期号：1
DOI：10.1038/srep04465
语种：English
出版社：Springer Nature
摘要：Improving transport current has been the primary topic for practical application of superconducting wires and tapes. However, the porous nature of powder-in-tube (PIT) processed iron-based tapes is one of the important reasons for low critical current density ( J _c) values. In this work, the superconducting core density of ex-situ Sr_0.6K_0.4Fe₂As₂ + Sn tapes, prepared from optimized precursors, was significantly improved by employing a simple hot pressing as an alternative route for final sintering. The resulting samples exhibited optimal critical temperature ( T _c), sharp resistive transition, small resistivity and high Vickers hardness ( Hv ) value. Consequently, the transport J _c reached excellent values of 5.1 × 10⁴ A/cm² in 10 T and 4.3 × 10⁴ A/cm² in 14 T at 4.2 K, respectively. Our tapes also exhibited high upper critical field H _c2 and almost field-independent J _c. These results clearly demonstrate that PIT pnictide wire conductors are very promising for high-field magnet applications.