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arXiv · 1205.5692

Fractional Power-Law Spectral Response of CaCu3Ti4O12 Dielectric: Many-Body Effects

Jitender Kumar·A. M. Awasthi
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Abstract

Spectral character of dielectric response in CaCu3Ti4O12 across 0.5Hz-4MHz over 45-200K corresponding to neither the Debyean nor the KWW relaxation patterns rather indicates a random-walk like diffusive dynamics of moments. Non-linear relaxation here is due to the many body dipole-interactions, as confirmed by spectral-fits of our measured permittivity to the Dissado-Hill behaviour. Fractional power-laws observed in ε*(ω) macroscopically reflect the fractal microscopic configurations. Below ~100K, the power-law exponent m (n) steeply decreases (increases), indicating finite length-scale collective response of moment-bearing entities. At higher temperatures, m gradually approaches 1 and n falls to low values, reflecting tendency towards the single-particle/Debyean relaxation.

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Jitender Kumar, A. M. Awasthi. 2012-05-25. Fractional Power-Law Spectral Response of CaCu3Ti4O12 Dielectric: Many-Body Effects. https://doi.org/10.1063/1.4745784

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