Affiliation: | (1) Department of Physics, M.L. Sukhadia University, 313 002 Udaipur, India;(2) Department of Physics, University of Rajasthan, 302 004 Jaipur, India;(3) Solid State Physics Division, Bhabha Atomic Research Centre, 400 085 Mumbai, India;(4) Present address: International Atomic Energy Agency, NAPC, Vienna, Austria |