Institution: | 1. Department of Physics , University of Allahabad , Allahabad-211002, India;2. Department of Physics , VSSD College, Chatrapati Shahu Ji Maharaj University , Nawabganj, Kanpur-208002, India;3. Centre of Material Sciences, University of Allahabad , Allahabad-211002, India;4. Institute of Chemistry, Military University of Technology , Warsaw 00-908, Poland |