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-xTiO3 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.

Department(s)

Mechanical and Aerospace Engineering

Comments

Y.G, V.G., and L.Q.C. acknowledge the financial support by the U.S. National Science Foundation under NSF-DMR-0908718, NSF-DMR-0820404, and NSFDMR-1210588.

Keywords and Phrases

Europium; Phase transitions; Antiferromagnetism

International Standard Serial Number (ISSN)

1098-0121; 1550-235X

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2013 American Physical Society (APS), All rights reserved.

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