Frequency-Dependent Conductivity in NbSe sub(3)

The observation of a frequency-dependent conductivity ( sigma ) and dielectric constant ( epsilon ) in NbSe sub(3) is reported. In both charge-density-wave phases a strong frequency dependence and huge dielectric constant are observed below 100MHz, with greatest effects observed at 42 K. The conductivity sigma increases smoothly from the dc value to the high-frequency (f)=100MHz) limit; this increase is accompanied by the reduction of epsilon . A resistance-capacitance networkmodel is suggested to account for the observed frequency dependence.