engleski

Thermopower and resistivity of K0.3MoO3 and Rb0.3MoO3

We report on very precise measurement of thermopower and resistivity of K-and Rb- blue bronze, K0.3MnO3 and Rb0.3MnO3. We have found that, as in K0.3MnO3, there exists a deep low temperature minimum in the thermopower of Rb0.3MnO3. There are some indications that it is due to phonon drag. However, it is interesting that the low temperature behaviour of the thermopower can be correlated to the resistivity. This correlation can explain why the thermopower does not follow simple 1/T behaviour above the minimum. Owning to our precise measurements, we are able to determine the temperature of the phase transition, TP, by the thermopower as well as by the resistivity data. The extracted values give that TP is 177.5 K for K0.3MnO3 177.8 K for Rb0.3MnO3, i.e. the same value within the errors of the measurements.

CDW; thermopower

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