作者机构:[1]Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China, [2]The High School Affiliated to Renmin University of China, Beijing 100080, China
相关基金:Acknowledgements This work was financially supported by the Na- tional Science Foundation of China (Nos. 50701044 and 50890171), and the Ministry of Science and Technology of China (No. 2005CB623604).