作者机构:[1]Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China, [2]Centre for Neutron Research, National Institute of Standards and Technology, Caithersburg, Maryland 20899, USA
相关基金:Project supported by the National Natural Science Foundation of China (Grant No. 50631040) and the National Basic Research Program of China (Grants Nos. 2006CB601101 and 2006CB605101).