Affiliation: | L.Kavitha a)b)c),M.Saravanan a),and D.Gopi c)d) a) Department of Physics,Periyar University,Salem-636 011,Tamilnadu,India b) The Abdus Salam International Centre for Theoretical Physics,Trieste,Italy c) Center for Nanoscience and Nanotechnology,Periyar University,Salem-636 011,Tamilnadu,India d) Department of Chemistry,Periyar University,Salem-636 011,Tamilnadu,India |