1. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
2. Technical Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
3. High Pressure and Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
4. Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India