| Affiliation: | 1. Ordered Matter Science Research Center, Southeast University, Jiangning District, Nanjing 211189 (P. R. China), Fax: (+86)?25‐5209‐0626;2. Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Chengfu Road 202, Beijing 100871 (P. R. China), Fax: (+86)?10‐6275‐1708;3. Department of Physics & Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, North Zhongshan Road 3663, Shanghai 200062 (P. R. China) |
