作者机构:[1]National Laboratory for Superconductivity, Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China, [2]Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
相关基金:Project supported by the National Basic Research Program of China (Grant Nos. 2006CB921107 and 2010CB630704) and the National Natural Science Foundation of China (Grant No. 10774165).
Acknowledgement The authors are indebted to Jorg Zegenhagen of the ESRF and Yixi Su of the JCNS at Garching for helpful discussions.