1. Department of Physics, Cauvery College for Women, Tiruchirappalli - 620018, India, Department of Physics, St. Joseph’s College (Autonomous), Tiruchirappalli - 620002, India, Crystal Growth and Thin Film Laboratory, School of Physics, Bharathidasan University, Tiruchirappalli - 620024, India, Department of Physics, Kalasalingam University, Krishnan Koil - 626 190, India, and Institute of Physics, University of Neuchâtel, Rue Emile-Argand 11, CP 158, CH-2009 Neuchâtel