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We have measured the thermoelectric power of charge density wave system$o$-TaS$_{3}$ in a wide temperature range between 10 K and 300 K. All featurescharacteristic for charge density wave systems have been observed; strongincrease below charge density transition temperature $T_{P}$, peak at$T_{M}\sim$1/2-1/3 $T_{P}$ and change of sign at lower temperatures. Thesefeatures can be explained by two contributions; free carriers drag by theoptical phonons with frequencies close to the density wave gap value in thepeak region and above, and hopping of localized carriers of opposite charge tofree carriers at low temperatures. We argue that these are common mechanisms ofthermoelectric power generation in all charge density wave systems.

Optical phonon drag and variable range hopping mechanisms of thermoelectric power generation in charge density wave system o-TaS$_{3}$}