Colossal Dielectric Constants in Braced Lattices with Defects

A. P. Ramirez; G. Lawes; V. Butko; M. A. Subramanian; C. M. Varma

Colossal Dielectric Constants in Braced Lattices with Defects

Condensed Matter 2007-05-23 v1

Authors: A. P. Ramirez , G. Lawes , V. Butko , M. A. Subramanian , C. M. Varma

Abstract

The dielectric constant of CaCu3Ti4O12 is measured with a different electrode geometry than previous measurements. Similar colossal values are obtained showing that they are "intrinsic" to the material. We show that in braced structures such as CaCu3Ti4O12, a small concentration O(10-3) of defects, which disrupt the bracing and relax between different equivalent configurations, can lead to colossal dielectric constants above a characteristic temperature. The dielectric constant e(w,T) has a frequency and temperature dependence of the same form as found experimentally.

Keywords

colossal dielectric constant CaCu3Ti4O12 braced lattice defects dielectric response

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@article{arxiv.cond-mat/0209498,
  title  = {Colossal Dielectric Constants in Braced Lattices with Defects},
  author = {A. P. Ramirez and G. Lawes and V. Butko and M. A. Subramanian and C. M. Varma},
  journal= {arXiv preprint arXiv:cond-mat/0209498},
  year   = {2007}
}

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9 pages, 2 figures

Colossal Dielectric Constants in Braced Lattices with Defects

Abstract

Keywords

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