1. Department of Physics, Karpagam Academy of Higher Education, Coimbatore, Tamil Nadu, India
2. Department of Physics, School of Advanced Sciences, Kalasalingam Academy of Research and Education, Krishnankoil, Tamil Nadu, India
3. Condensed Matter Physics Laboratory, International Research Centre, Kalasalingam Academy of Research and Education, Krishnankoil, Tamil Nadu, India
4. Department of Physics, University College of Engineering Nagercoil, Anna University, Nagercoil, Tamil Nadu, India