Low-symmetry monoclinic ferroelectric phase stabilized by oxygen octahedra rotations in strained EuxSr1-xTiO3 thin films

Anna N. Morozovska, Yijia Gu, Victoria V. Khist, Maya D. Glinchuk, Long Qing Chen, Venkatraman Gopalan, Eugene A. Eliseev

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15 Scopus citations

Abstract

Using Landau-Ginzburg-Devonshire theory and phase-field modeling, we explore the complex interplay between a structural order parameter (oxygen octahedron rotation) and polarization in EuxSr1-xTiO 3 thin films. Under a biaxially tensile strain, a low-symmetry monoclinic phase with in-plane ferroelectric polarization is found to be stabilized by antiferrodistortive oxygen octahedra tilts. The monoclinic phase is stable over a wide temperature range. It is characterized by a large number of energetically equivalent polar and structural twin domains. This work demonstrates the development of a spontaneous polarization and piezo- and pyroelectricity in a ferroelastic twin boundary arising from flexoelectric coupling and rotostriction.

Original languageEnglish (US)
Article number134102
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume87
Issue number13
DOIs
StatePublished - Apr 10 2013

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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