1. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
2. Homi Bhabha National Institute, Anushakti Nagar, Mumbai 400094, India
3. UGC-DAE Consortium for Scientific Research—Mumbai Centre, Trombay, Mumbai 400085, India
4. Materials Science Division, Bhabha Atomic Research Centre, Mumbai 400085, India
5. Technical Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
6. Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India