The observation of a frequency-dependent conductivity (σ) and dielectric constant (ε) in NbSe3 is reported. In both charge-density-wave phases a strong frequency dependence and huge dielectric constant are observed below 100 MHz, with greatest effects observed at 42 K. The conductivity σ increases smoothly from the dc value to the high-frequency (f=100 MHz) limit; this increase is accompanied by the reduction of ε. A resistance-capacitance network model is suggested to account for the observed frequency dependence.
©1980 American Physical Society
G. Grüner, L. C. Tippie, J. Sanny, W. G. Clark, and N. P. Ong, "Frequency-Dependent Conductivity in NbSe3," Phys. Rev. Lett. 45, 935-938 (1980).