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Letter
Nature Materials 3, 774–778 (1 November 2004) | doi:10.1038/nmat1238
Strong nonlinear current|[ndash]|voltage behaviour in perovskite-derivative calcium copper titanate
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Abstract
The discovery of a giant dielectric constant of 105 in CaCu3Ti4O12 has increased interest in this perovskite-type oxide. Here we demonstrate that, in addition to high permittivity, CaCu3Ti4O12 has remarkably strong nonlinear current–voltage characteristics without the addition of any dopants.
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