1. Department of Physics, SGRR(PG) College, Dehradun, Uttarakhand, India
2. Department of Physics, SGT University, Gurugram, Haryana, India
3. Department of Physics Pt. L. M. S. Govt. P. G. College, Rishikesh, Uttarakhand, India
4. Centre of Material Sciences, University of Allahabad, Prayagraj, UP, India
5. National Physical Laboratory (CSIR), New Delhi, India