[Jia, Pin-Zhen; Xie, Zhong-Xiang; Deng, Yuan-Xiang; Yu, Xia; Xie, Jia-Ping; Zhang, Yong] Hunan Inst Technol, Dept Math & Phys, Hengyang 421002, Peoples R China.
[Chen, Xue-Kun] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.
[Zhou, Wu-Xing; Zeng, Yu-Jia] Hunan Univ Sci & Technol, Sch Mat Sci & Engn, Xiangtan 411201, Peoples R China.
[Zhou, Wu-Xing; Zeng, Yu-Jia] Hunan Univ Sci & Technol, Hunan Prov Key Lab Adv Mat New Energy Storage & Co, Xiangtan 411201, Peoples R China.