Journal
PHYSICAL REVIEW B
Volume 87, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.87.134102
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Funding
- State Fund for Fundamental Research of Ukraine, SFFR-NSF [UU48/002]
- U.S. National Science Foundation [NSF-DMR-0908718, NSF-DMR-0820404, NSF-DMR-1210588]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [908718] Funding Source: National Science Foundation
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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. DOI: 10.1103/PhysRevB.87.134102
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