1. International and Inter University Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University, Kottayam, Kerala 686 560, India
2. Seismology Department, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
3. School of Pure and Applied Physics, Mahatma Gandhi University, Kottayam, Kerala 686 560, India
4. School of Nanoscience and Nanotechnology, Mahatma Gandhi University, Kottayam, Kerala 686560, India
5. High Pressure & Synchroton Radiation Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
6. Homi Bhabha National Institute, Trombay, Mumbai 400085, India