[1] Chinese Acad Sci, Inst Phys, State Key Lab Magnetism, Beijing 100080, Peoples R China
[2] Univ Sci & Technol China, Dept Phys, Anhua 230026, Peoples R China
[3] Chinese Acad Sci, Ctr Condensed Matter Phys, Beijing 100080, Peoples R China
[4] Beijing Univ, State Key Lab Rare Earth Mat Chem & Applicat, Beijing 100871, Peoples R China