Volume 64, Number 4, November 2003
|Page(s)||482 - 488|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 November 2003|
On the effective conductivity of flat random two-phase models
Landau Institute for Theoretical Physics
Chernogolovka, Moscow Region, Russia, 142432
Corresponding author: firstname.lastname@example.org
Accepted: 2 September 2003
An approximate functional equation for the effective conductivity of systems with a finite maximal scale of inhomogeneities is deduced. An exact solution of this equation is found and its physical meaning is discussed. A two-phase randomly inhomogeneous model is constructed by a hierarchical method and its effective conductivity at arbitrary phase concentrations is found in the mean-field–like approximation. These expressions satisfy all the necessary symmetries, reproduce the known formulas for in the weakly inhomogeneous case and coincide with two recently found partial solutions of the duality relation. It means that even of the two-phase randomly inhomogeneous system may be a nonuniversal function and can depend on some details of the structure of the inhomogeneous regions. The percolation limit is briefly discussed.
PACS: 73.61.-r – Electrical properties of specific thin films / 75.70.Ak – Magnetic properties of monolayers and thin films
© EDP Sciences, 2003
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