Affiliation: | (1) Department of Materials Science, Indian Association for the Cultivation of Science, 700 032 Jadavpur, Kolkata, India;(2) Department of Physics, A. P. C. College, New Barrackpore, 24-Paraganas (N), 743 276, India;(3) Department of Physics, Vivekananda Mahavidyalaya, 712 405 Haripal, Hooghly, India |