Enhanced transport critical current of iron-based superconducting joints. (4th January 2019)

• Record Type: Journal Article
• Authors: Zhu, Yanchang; Wang, Dongliang; Huang, He; Xu, Guangxian; Liu, Shifa; Cheng, Zhe; Ma, Yanwei
• Is Part Of: Superconductor science & technology. Volume 32:Number 2(2019:Feb.)
• Publication Date: 2019-01-04
• Subjects: superconducting joints -- iron-based superconductor -- transport critical current -- hot-pressing; Superconductivity -- Periodicals; Superconductors -- Periodicals; 537.623
• DOI: 10.1088/1361-6668/aaf45a
• Languages: English
• ISSNs: 0953-2048

Abstract

Abstract: Superconducting joints are one of the crucial components to make Sr1−x Kx Fe2 As2 (Sr-122) superconducting wires or tapes successful for future high-field, high-homogeneity magnetic application. In this paper, the hot-pressing process for an iron-based superconducting joint of Sr-122 tapes was optimized. The microstructures, superconducting properties and element distribution in the connection areas were researched. The transport properties of the iron-based superconducting joints were enhanced by prolonging the holding time at high pressure, which prevents potassium loss in the iron-based superconducting joint. The best transport critical current that was achieved was 57 A at 4.2 K and 10 T; meanwhile, the critical current ratio (CCR = I c joint / I c non-joint ) of the joint was realized to be 63.3%, which is the highest value of an iron-based superconducting joint reported so far. These results clearly demonstrate that iron-based superconductors are very promising for high-field magnet applications.