1. Department of Physics, National Institute of Technology, Hamirpur, Himachal Pradesh 177005, India
2. Department of Applied Sciences, Beant College of Engineering and Technology, Gurdaspur, PB 143521, India
3. UGC-DAE Consortium for Scientific Research, Indore, Madhya Pradesh 452001, India
4. Department of Material Science and Engineering, National Institute of Technology, Hamirpur, Himachal Pradesh 177005, India