Low-Frequency Behavior of Pinned Charge-Density-Wave Condensates

Abstract

Low-frequency conductivity measurements (100 Hz to 100 MHz) are reported in the charge-density-wave state of orthorhombic Ta${\mathrm{S}}_3$. The observed frequency-dependent response is in clear disagreement with recent predictions which are based on the Fukuyama-Lee model. The results can be described by $\sigma \left(\omega \right)=A{\left(i\omega \right)}^{\alpha }$, with $\alpha <1\mathrm{}$, in a wide frequency range, suggesting relaxational dynamics associated with the collective mode.