1. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
2. Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
3. High Pressure Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
4. Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Mumbai 400005, India