1. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
2. Homi Bhabha National Institute, Anushaktinager, Mumbai 400094, India
3. Technical Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
4. Physics Department, Thin Film Lab., Dr. B. R. Ambedkar National Institute of Technology, Jalandhar 144011, India
5. Material Science Group, Inter University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110067, India
6. ISIS-Neutron and Muon Source, Rutherford Appleton Laboratory, Didcot, Oxon OX11 0QX, United Kingdom