1. Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, P. R. China
2. Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, P. R. China
3. Southwest Institute of Applied Magnetics, Mianyang 621000, P. R. China
4. School of Physics and Optoelectronic Engineering, Anhui University, Hefei, Anhui 230601, P. R. China
5. School of Optical and Electronic Information, Suzhou City University, Suzhou 215104, P. R. China
6. Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, HFIPS, Chinese Academy of Sciences, Hefei 230031, P. R. China