1. Department of Physics, Sido Kanhu Murmu University, Dumka Jharkhand 814110, India
2. Department of Physics, Savitribai Phule Pune University, Pune Maharashtra 411007, India
3. Department of Physics, S. P. College, Dumka Jharkhand 814101, India
4. Department of Physics, Banaras Hindu University, Varanasi Uttar Pradesh 221005, India