ac conduction in iron bismuthate glassy semiconductors

Aswini Ghosh
Phys. Rev. B 42, 1388 – Published 15 July 1990
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Abstract

The first measurements are reported for the frequency-dependent ac conductivity for the iron bismuthate glassy semiconductors in the frequency range 102105 Hz and in the temperature range 80–450 K. The experimental data have been analyzed with reference to various theoretical models based on quantum-mechanical tunneling through the barrier and classical hopping over the barrier. The analysis shows that the correlated-barrier-hopping model is the most appropriate for the material under consideration. This model predicts quantitatively the temperature dependence of both the ac conductivity and its frequency exponent. However, other models, such as the quantum-mechanical tunneling model, are consistent with the low-temperature ac conductivity, but completely fail to interpret the observed temperature dependence of the frequency exponent. Similarly, the overlapping-large-polaron tunneling model can explain the temperature dependence of the frequency exponent at low temperature, although this model predicts the temperature dependence of the ac conductivity to be much higher than what the experimental data show.

  • Received 3 January 1990

DOI:https://doi.org/10.1103/PhysRevB.42.1388

©1990 American Physical Society

Authors & Affiliations

Aswini Ghosh

  • Indian Association for the Cultivation of Science, Jadavpur, Calcutta 700 032, West Bengal, India

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Vol. 42, Iss. 2 — 15 July 1990

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