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Issue 14, 2002
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Dynamics of disordered dipolar systems

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The electrical response of defect centres, which are distributed randomly in space and interact via electrostatic forces, is examined by Monte Carlo simulation of dipolar lattice gas models. Coulomb interactions are found to have a profound influence on the a.c. conductivity or the dielectric loss spectrum, when the interaction strength becomes comparable to or exceeds the thermal energy. In that case we observe “nearly constant loss behaviour” in an intermediate frequency range, known as a universal phenomenon in disordered materials. For the same model we describe a dynamic pair approximation which qualitatively reproduces the simulated spectra. Our results suggest reconsideration of the question of consistency of the “asymmetric double well potential (ADWP)” model in attempts to interpret constant loss spectra measured at low temperature.

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Publication details

The article was received on 16 Nov 2001, accepted on 06 Feb 2002 and first published on 30 May 2002

Article type: Paper
DOI: 10.1039/B110484E
Citation: Phys. Chem. Chem. Phys., 2002,4, 3168-3172
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    Dynamics of disordered dipolar systems

    T. Höhr, P. Pendzig, W. Dieterich and P. Maass, Phys. Chem. Chem. Phys., 2002, 4, 3168
    DOI: 10.1039/B110484E

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