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

被引：58
作者：
Gao, Zhaoshun [1 ]
Ma, Yanwei [1 ]
Yao, Chao [1 ]
Zhang, Xianping [1 ]
Wang, Chunlei [1 ]
Wang, Dongliang [1 ]
Awaji, Satoshi [2 ]
Watanabe, Kazuo [2 ]
机构：
[1] Chinese Acad Sci, Inst Elect Engn, Key Lab Appl Superconduct, Beijing 100190, Peoples R China
[2] Tohoku Univ, Inst Mat Res, High Field Lab Superconducting Mat, Sendai, Miyagi 9808577, Japan
来源：
SCIENTIFIC REPORTS | 2012年 / 2卷
基金：
中国国家自然科学基金;
关键词：
SUPERCONDUCTIVITY; WIRES;
D O I：
10.1038/srep00998
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
From the application point of view, large critical current densities J(c) (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 1.7x10(4) A/cm(2) at 10 T and 1.43104 A/cm(2) at 14 T, respectively, these values are by far the highest ever reported for iron based wires and approach the J(c) 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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页数：4
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