Interplay of epitaxial strain and rotations in PbTiO3/PbZrO3 superlattices from first principles

J.L. Blok, David H.A. Blank, Augustinus J.H.M. Rijnders, Karin M. Rabe, David Vanderbilt

Research output: Contribution to journalArticleAcademicpeer-review

19 Citations (Scopus)

Abstract

We present first-principles calculations of the structural phase behavior of the [1:1] PbTiO3/PbZrO3 superlattice and the PbTiO3 and PbZrO3 parent compounds as a function of in-plane epitaxial strain. A symmetry analysis is used to identify the phases and clarify how they arise from an interplay between different structural distortions, including out-of-plane and in-plane polar modes, rotation of oxygen octahedra around out-of-plane or in-plane axes, and an antipolar mode. Symmetry-allowed intermode couplings are identified and used to elucidate the nature of the observed phase transitions. For the minimum-period [1:1] PbTiO3/PbZrO3 superlattice, we identify a sequence of three transitions that occur as the in-plane lattice constant is increased. All four of the phases involve substantial oxygen octahedral rotations, and an antipolar distortion is important in the high-tensile-strain phase. Inclusion of these distortions is found to be crucial for an accurate determination of the phase boundaries.
Original languageUndefined
Article number205413
Pages (from-to)-
Number of pages7
JournalPhysical review B: Condensed matter and materials physics
Volume84
Issue number20
DOIs
Publication statusPublished - 2011

Keywords

  • IR-104422
  • METIS-280150

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