Universal frequency-dependent ac conductivity of conducting polymer networks

Details Universal frequency-dependent ac conductivity of conducting polymer networks Universal frequency-dependent ac conductivity of conducting polymer networks

2008-05-16

arxiv.org/abs/0805.2483v1

APPLIED PHYSICS LETTERS Volume: 91 Issue: 12 Article Number: 122911 Published: SEP 17 2007

Physics

Condensed Matter

Disordered Systems and Neural Networks

8 pages plus 3 figures

Scientific paper

A model based on the aspect of the distribution of the length of conduction paths accessible for electric charge flow reproduces the universal power-law dispersive ac conductivity observed in polymer networks and, generally, in disordered matter. Power exponents larger than unity observed in some cases are physically acceptable within this model. A saturation high frequency region is also predicted, in agreement with experimental results. There does not exist a universal fractional power law (and is useless searching for a unique common critical exponent), but a qualitative universal behavior of the ac conductivity in disordered media.

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