Pressure dependence of the large-polaron transport in anatase TiO2 single crystals

We have measured the pressure and temperature dependences of the resistivity and the thermoelectric power of anatase, TiO2. The resistivity varies with T-3 at high temperatures, and its absolute value is in the 1 Omega cm range. Below 60 K, the resistivity is activated. Most surprisingly, the activation energy shows non-monotonic pressure dependence. The thermoelectric power has a very high value and its temperature dependence resembles that of polaronic materials. We suggest a large polaronic model to describe the temperature and pressure dependence of the two transport coefficients. Copyright (c) EPLA, 2012


Published in:
Europhysics Letters, 99, 5, 57005
Year:
2012
Publisher:
Mulhouse, Epl Association, European Physical Society
ISSN:
0295-5075
Keywords:
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 Record created 2012-09-22, last modified 2018-09-13

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