Affiliation: | a Physics Division, BU-DRDO Centre for Life Sciences, Bharathiar University, Coimbatore 641046, India b Solid State and Radiation Physics Laboratory, Department of Physics, Bharathiar University, Coimbatore 641046, India c Kalasalingam University, Anand Nagar, Krishnankoil 626190, Virudhunagar District, India |