Novel feature of the universal power law dispersion of the ac conductivity in disordered matter

The ac conductivity σac of different types of materials as a function of angular frequency ω is approximated by a ‘universal’ power law σac=Aωn, A and n are fitting parameters .The exponent and the pre-exponential factor depend on temperature, in general. In the present Letter, we suggest an empiric...

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Bibliographic Details
Published in:Journal of non-crystalline solids 2006-12, Vol.352 (50-51), p.5444-5445
Main Author: Papathanassiou, A.N.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Dielectric properties
Dielectric properties of solids and liquids
Dielectrics, piezoelectrics, and ferroelectrics and their properties
Electric modulus
Electronic transport in condensed matter
Exact sciences and technology
Permittivity (dielectric function)
Physics
Relaxation
Theory of electronic transport
scattering mechanisms
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Summary:The ac conductivity σac of different types of materials as a function of angular frequency ω is approximated by a ‘universal’ power law σac=Aωn, A and n are fitting parameters .The exponent and the pre-exponential factor depend on temperature, in general. In the present Letter, we suggest an empirical law that states that the temperature evolution of logA is proportional to the temperature evolution of n. Data reported on different materials ascertain that the ratio −logA/n is constant, regardless the nature of the material and the type of conductivity.
ISSN:0022-3093
1873-4812
DOI:10.1016/j.jnoncrysol.2006.08.019