Ming-Xing Huang, Changzeng Fan, Bo Xu, Jingyu Hou, Xi Shao, Xiao-Ji Weng, Xiang Zhang, Wentao Hu, Yufei Gao, Lin Wang, Zhisheng Zhao, Guochun Yang, Dongzhou Zhang, Yanbin Wang, Zhongyuan Liu, Xiang-Feng Zhou, and Yongjun Tian, “Hard Copper Boride with Exceptional Conductivity”, (2024) Phys. Rev. Lett. 133, 136301