1. High-performance Ba1-xKxFe2As2 superconducting joints for persistent current operation
- Author
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Zhu, Yanchang, Wang, Dongliang, Wang, Qiqi, Guo, Wenwen, Liu, Cong, Huang, He, Ma, Hongjun, Liu, Fang, Liu, Huajun, and Ma, Yanwei
- Subjects
Condensed Matter - Superconductivity - Abstract
Superconducting joints are one of the key technologies to make Ba1-xKxFe2As2 (Ba-122) superconducting wires or tapes for high-field applications. Herein, superconducting joints were fabricated by a simple cold-pressing method, and the joint resistance of the iron-based superconducting joint was estimated for the first time. The superconducting properties, microstructures, and elements distribution in the joint regions were investigated. At 4.2 K and 10 T, a transport critical current Ic of 105 A for the joint was obtained, and the critical current ratio (CCR= Ic-joint/Ic-tape) of the joint was 94.6%. On the other hand, the joint show very low joint resistance of 2.7x10^-13 ohm in self-field at 4.2 K. Among iron-based superconductors (IBS), this work is the first to successfully realize a superconducting joint with such high CCR and low joint resistance. This work shows great potential to apply Ba-122 in a range of practical applications, where superconducting joints are essential., Comment: 20 pages, 8 figures
- Published
- 2021
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