Effect of Zn incorporation on the a.c. conductivity of glassy Se70Te30 alloy S. Srivastava, N. Mehta, R. K. Shukla and A. Kumar Eur. Phys. J. Appl. Phys., 44 3 (2008) 217-221 Published online: 06 December 2008 DOI: 10.1051/epjap:2008171