1. C. N. R. Rao Center for Advanced Materials, Tumkur University, Tumkur 572103, India
2. Department of Physics, Acharya Institute of Graduate Studies, Bangalore 560107, India
3. Department of Physics, B.M.S. Institute of Technology, Visveswaraya Technological University affiliated, Bangalore 560064, India
4. National Assessment and Accreditation Council, Jain University, Jakkasandra Post, Kanakapura Taluk, Ramanagara Dist, Bengaluru 562112, India
5. Department of Physics, H.M.S. Institute of Technology, NH-4, Kaythsandra, Kesaramadu post, Tumakuru 572104, India