1. Hefei National Laboratory for Physical Science at MicroscaleDepartment of Materials Science & EngineeringNational Synchrotron Radiation Laboratory, and Collaborative Innovation Center of Suzhou Nano Science and TechnologyUniversity of Science and Technology of China Hefei 230026 P. R. China
2. The Anhui Key Laboratory of Condensed Mater Physics at Extreme ConditionsHigh Magnetic Field LaboratoryHefei Institutes of Physical ScienceChinese Academy of Sciences Hefei 230031 P. R. China