Strongly enhanced current densities in Sr0.6K0.4Fe2As2 + Sn superconducting tapes

被引：43

作者：

Lin, He ^{[1
]}

Yao, Chao ^{[1
]}

Zhang, Xianping ^{[1
]}

Zhang, Haitao ^{[1
]}

Wang, Dongliang ^{[1
]}

Zhang, Qianjun ^{[1
]}

Ma, Yanwei ^{[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 | 2014年 / 4卷

基金：

中国国家自然科学基金;

关键词：

BEHAVIOR; TAPES; WIRES;

D O I：

10.1038/srep04465

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：

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 Sr0.6K0.4Fe2As2 + 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 x 10(4) A/cm(2) in 10 T and 4.3 x 10(4) A/cm(2) 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.

引用

页数：5

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