1. Department of Physics, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara 390002, Gujarat, India
2. Department of Physics, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal 576104, India
3. Department of Physics, National Dong Hwa University, Hualien 97401, Taiwan
4. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India