1. Department of Materials Science & Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
2. Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
3. Department of Physics & Astronomy, National Institute of Technology, Rourkela-769008, India
4. Department of Materials Science & Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
5. Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
6. National Physical Laboratory (CSIR), Dr K. S. Krishnan Marg, New Delhi 110012, India
7. Departmental of Materials Science and Engineering, University of Rajshahi, Rajshahi 6205, Bangladesh
8. Department of Physics & Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA