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Abstract: We report first-principles calculations on the coupling between epitaxial strain, polarization, and oxygen octahedra rotations in monodomain (PbTiO3)n/(SrTiO3)n superlattices. We show how the interplay between (i) the epitaxial strain and (ii) the electrostatic conditions can be used to control the orientation of the main axis of the system. The electrostatic constrains at the interface facilitate the polarization rotation and, as a consequence, we predict large piezoelectric responses at epitaxial strains smaller than those required considering only strain effects. In addition, ferroelectric (FE) and antiferrodistortive (AFD) modes are strongly coupled. Usual steric arguments cannot explain this coupling and a covalent model is proposed to account for it. The energy gain due to the FE-AFD coupling decreases with the periodicity of the superlattice, becoming negligible for n?3.
Authorship: Aguado-Puente P., García-Fernández P., Junquera J.,
Fuente: Physical Review Letters
Publisher: American Physical Society
Year of publication: 2011
No. of pages: 5
Publication type: Article
DOI: 10.1103/PhysRevLett.107.217601
ISSN: 0031-9007,1079-7114
Spanish project: FIS2009-12721-C04-02
Publication Url: https://doi.org/10.1103/PhysRevLett.107.217601
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PABLO AGUADO PUENTE
PABLO GARCIA FERNANDEZ
FRANCISCO JAVIER JUNQUERA QUINTANA
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