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Effect of Zn incorporation on the a.c. conductivity of glassy Se70Te30 alloy

Published online by Cambridge University Press:  06 December 2008

S. Srivastava ,
N. Mehta ,
R. K. Shukla  and
A. Kumar
S. Srivastava
Affiliation:
Department of Physics, Harcourt Butler Technological Institute, Kanpur, India
N. Mehta
Affiliation:
Department of Physics, Banaras Hindu University, Varanasi, India
R. K. Shukla
Affiliation:
Department of Physics, Harcourt Butler Technological Institute, Kanpur, India
A. Kumar*
Affiliation:
Department of Physics, Harcourt Butler Technological Institute, Kanpur, India
*
dr_ashok_kumar@yahoo.com
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Abstract

The present work reports the temperature and frequency dependence of a.c. conductivity in glassy Se70Te30−xZnx (x = 0, 2, 4 and 6) alloys in the temperature range 300–500 K and frequency range 1 kHz. An agreement between experimental and theoretical results suggests that the a.c. conductivity behaviour of the present samples can be successfully explained by correlated barrier hopping (CBH) model. The density of defect states has been determined using this model for all the glassy alloys. The results show that bipolaron hopping dominates over single-polaron hopping in this glassy system. This is explained in terms of lower values of the maximum barrier height for single-polaron hopping.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 44 , Issue 3 , December 2008 , pp. 217 - 221
Copyright
© EDP Sciences, 2008

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