Universality of ac conduction in anisotropic disordered systems: An effective-medium-approximation

BUSTINGORRY SEBASTIAN

PHYSICAL REVIEW B - CONDENSED MATTER AND MATERIALS PHYSICS

American Physical Society

Lugar: New York; Año: 2005 vol. 71 p. 132201 - 132204

0163-1829

Anisotropic disordered systems are studied in this work within the random barrier model. In such systems the transition probabilities in different directions have different probability density functions. The frequency-dependent conductivity at low temperatures is obtained using an effective medium approximation. It is shown that the isotropic universal ac-conduction law, u = s ln s , is recovered if properly scaled conductivity (s) d and frequency (u) variables are used.