[1] Chinese Acad Sci, Fujian Inst Res Struct Matter, Haixi Inst, Xiamen, Peoples R China
[2] Chinese Acad Sci, Xiamen Inst Rare Earth Mat, Haixi Inst, Xiamen, Peoples R China
[3] Shanghai Tech Univ, Shanghai, Peoples R China
[4] Univ Chinese Acad Sci, Beijing, Peoples R China