Affiliation: | TIAN Yongjun GUO Liping XU Shifa LI Lin LU Huibin ZHOU Yueliang CHEN Zhenghao GUI Dafu ZHOU Yuqing YANG Ye ZHAO Zhongxian and YANG Guozhen(National Laboratory of Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China) |