Dipolar interactions and constant dielectric loss spectra

Article

Abstract.

Frequency-independent dielectric loss spectra constitute an ubiquitous phenomenon in strongly disordered materials. The degree of universality of this effect calls for a microscopic model that takes into account interactions and structural disorder, but otherwise requires only minimal assumptions. Under this point of view we review and further investigate the cooperative relaxation behaviour in an assembly of defect centres at frozen random positions. These centres carry an internal dipolar degree of freedom and interact by dipole-dipole forces. Such a description essentially amounts to studying the cooperative dynamics of interacting “asymmetric double well potential” (ADWP)-like centres, without invoking an ad hoc barrier distribution. Kinetic Monte Carlo simulations of an associated random dipolar lattice model show a transition from Debye to constant dielectric loss behaviour upon lowering the temperature. These results are interpreted with the help of analytic theories that focus on slow relaxation within strongly interacting nearest neighbour pairs of defects. Finally, a collective mode representation of the dielectric response derived from stochastic field theory is presented.

Keywords

European Physical Journal Special Topic Solid State Ionic Defect Centre Dielectric Susceptibility Barrier Distribution 

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Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2008

Authors and Affiliations

  1. 1.Universität KonstanzKonstanzGermany
  2. 2.Technische Universität Ilmenau , Institut für PhysikIlmenauGermany
  3. 3.Universität UlmUlmGermany

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