Extrinsic models for the dielectric response of CaCu{3}Ti{4}O{12}

Details Extrinsic models for the dielectric response of CaCu{3}Ti{4}O{12} Extrinsic models for the dielectric response of CaCu{3}Ti{4}O{12}

2003-04-08

arxiv.org/abs/cond-mat/0304196v1

Physics

Condensed Matter

Materials Science

9 pages, with 1 postscript figure embedded. Uses REVTEX and epsf macros. Also available at http://www.physics.rutgers.edu/~d

Scientific paper

10.1063/1.1595708

The large, temperature-independent, low-frequency dielectric constant recently observed in single-crystal CaCu{3}Ti{4}O{12} is most plausibly interpreted as arising from spatial inhomogenities of its local dielectric response. Probable sources of inhomogeneity are the various domain boundaries endemic in such materials: twin, Ca-ordering, and antiphase boundaries. The material in and neighboring such boundaries can be insulating or conducting. We construct a decision tree for the resulting six possible morphologies, and derive or present expressions for the dielectric constant for models of each morphology. We conclude that all six morphologies can yield dielectric behavior consistent with observations and suggest further experiments to distinguish among them.

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