Anderson transition and intermediate polaron formation in WO3-xTransport properties and optical absorption
- 1 November 1984
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine Part B
- Vol. 50 (5) , 607-620
- https://doi.org/10.1080/13642818408238882
Abstract
The temperature dependence of electrical conductivities In WO3-x (O ≤ x ≤ 0·28) has been investigated. These compounds show metallic behaviour for x < 0·10 and non-metallic behaviour for x < 0·10. An Anderson transition takes place for the composition WO2·90 with complete polaronic transport in the non-metallic phase. Optical and infrared absorption spectra were recorded for all compounds and they showed that polarons and quasi-free carriers are present simultaneously in the metallic phase. A tentative band model is derived from the experimental absorption spectra and the transport properties, and the influence of metallic dopants is discussed. It is found that the formation of intermediate polarons is independent of the polaron concentration, confirming theoretical predictions of Wegner and Entin-Wohlmann (1983).Keywords
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