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.
@article{arxiv.2109.14300,
title = {High-performance Ba1-xKxFe2As2 superconducting joints for persistent current operation},
author = {Yanchang Zhu and Dongliang Wang and Qiqi Wang and Wenwen Guo and Cong Liu and He Huang and Hongjun Ma and Fang Liu and Huajun Liu and Yanwei Ma},
journal= {arXiv preprint arXiv:2109.14300},
year = {2022}
}