Unusual behaviour of the ferroelectric polarization in PbTiO${}_3$/SrTiO${}_3$ superlattices

Abstract

Artificial PbTiO${}_3$/SrTiO${}_3$ superlattices were constructed using off-axis RF magnetron sputtering. X-ray diffraction and piezoelectric atomic force microscopy were used to study the evolution of the ferroelectric polarization as the ratio of PbTiO${}_3$ to SrTiO${}_3$ was changed. For PbTiO${}_3$ layer thicknesses larger than the 3-unit cells SrTiO${}_3$ thickness used in the structure, the polarization is found to be reduced as the PbTiO${}_3$ thickness is decreased. This observation confirms the primary role of the depolarization field in the polarization reduction in thin films. For the samples with ratios of PbTiO${}_3$ to SrTiO${}_3$ of less than one a surprising recovery of ferroelectricity that cannot be explained by electrostatic considerations was observed.

References in corpus (7)

• Theory of polarization enhancement in epitaxial BaTiO${}_3$/SrTiO${}_3$ superlattices
• Ferroelectricity and tetragonality in ultrathin PbTiO3 films
• First-principles study of symmetry lowering in relaxed BaTiO3/SrTiO3 superlattices
• Theory of structural response to macroscopic electric fields in ferroelectric systems
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• Epitaxially strained [001]-(PbTiO${}_3$)${}_1$(PbZrO${}_3$)${}_1$ superlattice and PbTiO${}_3$ from first principles
• Lattice instabilities of PbZrO3/PbTiO3 [1:1] superlattices from first principles

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