1. Department of Physics, Condensed Matter Research Laboratory (CMRL), Bannari Amman Institute of Technology (BIT), Sathyamangalam, India
2. Department of Physics, Erode Sengunthar Engineering College, Perundurai, Erode, India
3. Department of Physics, Manonmaniam Sundaranar University, Tirunelveli, India
4. Department of Chemistry, BIT, Sathyamangalam, India