1. School of Science, Tianjin University of Commerce, Tianjin 300134, P. R. China
2. Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerce, Tianjin 300134, P. R. China
3. State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin 300072, P. R. China
4. Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology, School of Science, Tianjin University, Tianjin 300072, P. R. China
5. School of Physics, Institute for Research in Fundamental Sciences, IPM, Tehran 19395-5531, Iran