[1] Bishop Moore Coll, Ctr Sustainable Energy & Environm Technol CET, Dept Phys, Mavelikara 690110, Kerala, India
[2] Cauvery Coll Women, Dept Phys, Trichy 620018, India
[3] TKM Coll Arts & Sci, Dept Phys, Kollam, Kerala, India
[4] Bishop Moore Coll, Dept Chem, Alappuzha 690110, Kerala, India
[5] Bhabha Atom Res Ctr, Solid State Phys Div, Trombay 85,Room 307,CMPD Bldg, Mumbai 400085, Maharashtra, India