1. Department of Physics, Berhampur University, Berhampur 760007, Orissa, India.
2. Department of Physics, Ravenshaw University, Cuttack, Odisha, India.
3. Department of Physics, S.A. Mohavidyalaya, Balipatana, Khurda, Odisha, India.
4. Department of Physics, S.V.M. (Auto) College, Jagtsinghpur, Odisha, India.