Polarization Enhancement in Short Period Superlattices via Interfacial Intermixing

preprint2007arXivOpen access

Abstract

The effect of intermixing at the interface of short period PbTiO3_3/SrTiO3_3 superlattices is studied using first-principles density functional theory. The results indicate that interfacial intermixing significantly enhances the polarization within the superlattice. This enhancement is directly related to the off-centering of Pb and Sr cations and can be explained through a discussion of interacting dipoles. This picture should be general for a wide range of multicomponent superlattices and may have important consequences for the design of ferroelectric devices.

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