Affiliation: | 1.Department of Physics, B V Raju Institute of Technology, Narsapur, Medak, Telangana, 502313, India ;2.Department of Physics, JNTU Hyderabad, Kukatpally, Hyderabad, Telangana, 500085, India ;3.Department of Physics, University PG College, Secunderabad, Osmania University, Hyderabad, Telangana, 500003, India ; |