Achieving superconducting joinings with large current capacities is a challenge for magnetic resonance imaging applications of YBa₂Cu₃O_7-δ (YBCO) coated conductors (CCs). Here we report a novel method to fabricate a superconducting joining between two YBCO CCs using a joining strap consisting of YBCO, Ag, a buffer, and a substrate. The YBCO layer exfoliated from the buffer stack of a YBCO CC can retain more than 90% of its original critical current (I_c). This is particularly due to the Ag layer serving as a fast oxygen diffusion path to promote the recovery of superconductivity of the YBCO layer during oxygenation annealing. The atomic arrangement at the joined YBCO interface is well aligned along the (001) plane, enabling superior superconducting performance. The method reported here provides a practicable solution to achieve persistent current mode operation in second-generation high-temperature superconducting magnet applications.

实现具有大电流容量的超导连接对于 YBa ₂ Cu ₃ O _{7- δ} (YBCO) 涂层导体 (CC) 的磁共振成像应用而言是一项挑战。在这里，我们报告了一种使用由 YBCO、Ag、缓冲器和基板组成的连接带在两个 YBCO CC 之间制造超导连接的新方法。从 YBCO CC 的缓冲堆栈上剥离的 YBCO 层可以保留其原始临界电流的 90% 以上（I _c）。这尤其是由于 Ag 层用作快速氧扩散路径以促进氧化退火期间 YBCO 层的超导性恢复。加入的 YBCO 界面处的原子排列沿 (001) 平面排列良好，可实现卓越的超导性能。这里报告的方法提供了一种可行的解决方案，以在第二代高温超导磁体应用中实现持续电流模式操作。