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      Interfacial Polarization and Pyroelectricity in Antiferrodistortive Structures Induced by a Flexoelectric Effect and Rotostriction

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          Abstract

          Theoretical analysis based on the Landau-Ginzburg-Devonshire (LGD) theory is used to show that the product effect of flexoelectricity and rotostriction can lead to a spontaneous polarization in the vicinity of antiphase boundaries, ferroelastic twin walls, surfaces and interfaces in the octahedrally tilted phase of otherwise non-ferroelectric perovskites such as CaTiO3, SrTiO3, and EuTiO3. As an example, we numerically demonstrate a large spontaneous polarization on the order of 1-5muC/cm2 at the SrTiO3 antidistortive phase boundaries at temperatures lower than the antiferrodistortive structural phase transition temperature of ~105 K

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          Author and article information

          Journal
          29 July 2011
          2011-10-24
          Article
          10.1103/PhysRevB.85.094107
          1108.0019
          e696f6ab-4806-4c3f-9a20-b78167c943be

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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          61 page, 24 figures, 1 table; Extended version including twin domain walls
          cond-mat.mtrl-sci

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