Ferroelectric PbTiO$_{3}$/SrRuO$_{3}$ superlattices with broken inversion symmetry

Details Ferroelectric PbTiO$_{3}$/SrRuO$_{3}$ superlattices with broken inversion symmetry Ferroelectric PbTiO$_{3}$/SrRuO$_{3}$ superlattices with broken inversion symmetry

2012-01-13

arxiv.org/abs/1201.2893v1

Physics

Condensed Matter

Materials Science

Scientific paper

We have fabricated PbTiO$_{3}$/SrRuO$_{3}$ superlattices with ultra-thin SrRuO$_{3}$ layers which act as dielectric, rather than metallic, elements. The superlattices display both ferroelectricity and, as the volume fraction of PbTiO$_{3}$ is reduced, an increasingly important effect of polarization asymmetry due to compositional inversion symmetry breaking. The results are significant as they represent a new class of ferroelectric superlattices. By expanding our set of materials we are able to introduce new behaviors that can only occur when one of the materials is not a perovskite titanate. Here, compositional inversion symmetry breaking in bi-color superlattices, due to the combined variation of A and B site ions within the superlattice, is demonstrated using a combination of experimental measurements and first principles density functional theory.

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