Abstract
The a.c. conductivity of chalcogenide glasses is well fitted at low temperature by the expression Σ a.c.= Aω s T n where s=1 and n≤0.5. This expression is consistent with correlated barrier hopping (CBH) of bipolarons between both random and paired defects. However, a study of the temperature and frequency dependence of the capacitance shows that in a-SiO 2 and a-GeSe 2 the capacitance obeys the scaling relation: C= A ln ( Tω −1). This result would suggest that the a.c. conduction mechanism in chalcogenide glasses may be better described by tunneling relaxation than by CBH.
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