1. Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng 475004, P. R. China
2. Department of Technology and Physics, Zhengzhou University of Light Industry, Zhengzhou 450002, China
3. Institute for Superconducting and Electronic Materials, Innovation Campus, University of Wollongong, Squires Way, North Wollongong 2522, Australia