1. a Department of Physics , Indian Institute of Technology Hyderabad , 502205 , Ordnance Factory Campus Yeddumailaram , Andhra Pradesh , India
2. b Advanced Centre of Research in High Energy Materials (ACRHEM), University of Hyderabad , Prof. C.R. Rao Road, Gachibowli, 500046 , Hyderabad , Andhra Pradesh , India