Effective medium approximation for flicker noise and weak nonlinearities in composite media

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Abstract

An unambiguous formulation of the self-consistent effective medium approximation (SEMA) is presented and then applied to the problem of flicker noise in a composite conductor where each component has a small nonlinear (power law) correction to the Ohmic conductivity. The results, while reasonable for dilute systems, lead to seemingly strange results (e.g., infinite flicker noise and infinite nonlinear conductivity) for a nondilute metal-insulator mixture. These are explained in terms of the special microstructure for which SEMA is exact and demonstrate the great sensitivity of flicker noise and nonlinear conductivity to microstructural details.

Original languageEnglish
Pages (from-to)546-550
Number of pages5
JournalPhysica A: Statistical Mechanics and its Applications
Volume168
Issue number1
DOIs
StatePublished - 1 Sep 1990

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