1. Department of Physics, Siksha ‘O’ Anusandha (Deemed to be University), Bhubaneswar, India;
2. Department of Electronics and Instrumentation, Siksha ‘O’ Anusandhan (Deemed to be University), Bhubaneswar, India;
3. Material Research Laboratory, School of Physics, Sambalpur University, Jyoti Vihar, Burla, India