Abstract
We have measured the frequency ω/2 π dependence of the complex conductivity ( σ′ and σ′') of conducting composites of carbon-black particles in a non-conducting polymer matrix up to 0.6 THz. The concentration p ranges from just above the percolation threshold p c up to 33 p c . Temperatures T were varied between 4.2 K and 300 K. When scaled to σ DC, σ′( T, ω) shows a unique dependence on ω, independent of T. We show how this relation follows from the hopping mechanism and relate the data to the microscopic hopping parameters.
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