Frequency-Dependent Conductivity in NbSe3

The observation of a frequency-dependent conductivity ( sigma ) and dielectric constant ( epsilon ) in NbSe3 is reported. In both charge-density-wave phases a strong frequency dependence and huge dielectric constant are observed # < 100 MHz, with greatest effects observed at 42 deg K. The conductivity sigma increases smoothly from the d.c. value to the high-frequency (f = 100 MHz) limit; this increase is accompanied by the reduction of epsilon . A resistance-capacitance network model is suggested to account for the observed frequency dependence.17 refs.--AA