Abstract
Abstract Although the a.c. conductivity of amorphous chalcogenides in the radio frequency region has been well interpreted by the combined mechanism of correlated barrier hopping (CBH) of bipolarons and single polarons based on charged defects, it is not clear whether the CBH model can be extended to the microwave region. The validity of the CBH of bipolarons with regard to both the frequency and temperature dependencies of conductivity is examined in the microwave region. It is concluded that the observed microwave optical absorption (conductivity) is well interpreted in terms of the CBH of bipolarons for glassy Se, As2Se3, As2S3, As2Te3, (As2Te3)1-x Ge x and Tl2SeAs2Te3.
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