1. Laser Spectroscopy and Nanomaterials Lab, Physics Department, University of Allahabad, Allahabad, India
2. Centre of Environmental Science, Botany Department, University of Allahabad, Allahabad, India
3. School of Physics, University of Hyderabad, Hyderabad, India
4. Variable Energy Cyclotron Centre, Kolkata 700064, India
5. Magnetic and Multiferroic, National Physical Laboratory (NPL), New Delhi, India