Frequency-Dependent Thermoelectric Power inK0.3MoO3

We have measured the frequency dependence of the thermoelectric power, $S$, in the charge-density-wave state of ${\mathrm{K}}_{0.3}$Mo${\mathrm{O}}_3$. A strong frequency dependence with both real and imaginary components was observed, and we interpret our finding in terms of a two-fluid model. We also discuss the criteria of observability of this novel phenomenon in other materials where the electrical conductivity is frequency dependent.