1. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
2. Homi Bhabha National Institute, Mumbai 400094, India
3. Government Girls College, Vidisha, Madhya Pradesh 464001, India
4. Technical Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
5. Process Development Division, Bhabha Atomic Research Centre, Mumbai 400085, India