Effect of metal (Zn/In/Pb) additions on the microstructures and superconducting properties of Sr_{1 − x}K_xFe₂As₂ tapes

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• 作者：He Lin ; Chao Yao ; Xianping Zhang ; Haitao Zhang ; Qianjun Zhang ; Dongliang Wang ; Chiheng Dong ; Yanwei Ma ; ^{ywma@mail.iee.ac.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Iron-based superconductors ; Metallic additives ; Superconductivity ; Microstructure
• 刊名：Scripta Materialia
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：112
• 期：Complete
• 页码：128-131
• 全文大小：1463 K

文摘

Zn-, In- and Pb-added Ag-sheathed Sr_1 − xK_xFe₂As₂ tapes were fabricated through the powder-in-tube method. All added tapes are found to have increased transport J_c at 4.2 K in fields up to 14 T than the pure samples. The best J_c result has been achieved in Zn-added tapes. Microstructure investigations reveal that Zn addition can improve both phase uniformity and grain connectivity of Sr_1 − xK_xFe₂As₂, thus resulting in higher J_c. Furthermore, the critical temperature for the added tapes decreased very slightly (only about 0.4 K). The role of Zn addition may be beneficial in promoting a large range of applications for iron-pnictide conductors.