1. School of Materials Science and Engineering, State Key Laboratory of Material Processing and Die & Mold Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
2. College of Mechanical and Material
Engineering, Three Gorges University, 8
Daxue Road, Yichang, Hubei 443002, China
3. Department of Physics, Sam Houston State University, Huntsville, Texas 77341,
United States
4. Department
of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, United
States and NSLS, Brookhaven National Laboratory, Upton, New York 11973, United States