1. 1Department of Physics, B.S. Abdur Rahman Crescent Institute of Science and Technology, Chennai-600048, India 2Research Department of Physics, Khadir Mohideen College (affiliated to Bharathidasan University, Thiruchirappalli), Adirampattinam-614701, India
2. Department of Physics, B.S. Abdur Rahman Crescent Institute of Science and Technology, Chennai-600048, India
3. PG and Research Department of Physics, Arul Anandar College, Karumathur, Madurai-625514, India
4. Department of Material Science, Central University of Tamil Nadu, Thiruvarur-610001, India
5. Research Department of Physics, Khadir Mohideen College (affiliated to Bharathidasan University, Thiruchirappalli), Adirampattinam-614701, India