1. Department of Physics, Saveetha Engineering College (Autonomous), Chennai, Tamil Nadu 602105, India
2. Department of Physics, Sri Sarada College for Women (Autonomous), Salem, Tamil Nadu 636016, India
3. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
4. Futuristic Materials Research Centre for Planetary Exploration, Department of Physics and Nanotechnology, College of Engineering and Technology, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur, Kancheepuram, Tamilnadu 603 203, India
5. Materials Science Research Laboratory, Department of Physics, Periyar University, Salem, Tamil Nadu 636 011, India