Strain-coupled ferroelectric polarization in BaTiO3 - CaTiO3 superlattices

Sung Seok A. Seo; Ho Nyung Lee

doi:10.1063/1.3153512

Strain-coupled ferroelectric polarization in BaTiO3 - CaTiO3 superlattices

Sung Seok A. Seo, Ho Nyung Lee

Materials Science and Technology Div

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27 Scopus citations

Abstract

We report on growth and ferroelectric (FE) properties of superlattices (SLs) composed of the FE BaTiO3 and the paraelectric CaTiO3. Previous theories have predicted that the polarization in (BaTiO3) n/ (CaTiO3) n SLs increases as the sublayer thickness (n) increases when the same strain state is maintained. However, our BaTiO3 / CaTiO3 SLs show a varying lattice-strain state and systematic reduction in polarization with increasing n while coherently strained SLs with n=1 and 2 show a FE polarization of ca. 8.5 μC/ cm2. We suggest that the strain coupling plays a more important role in FE properties than the electrostatic interlayer coupling based on constant dielectric permittivities.

Original language	English
Article number	232904
Journal	Applied Physics Letters
Volume	94
Issue number	23
DOIs	https://doi.org/10.1063/1.3153512
State	Published - 2009

Funding

We thank V. R. Cooper, H. M. Christen, and K. M. Rabe for useful discussions and comments. This work was sponsored by the Division of Materials Sciences and Engineering, U.S. Department of Energy.

Funders	Funder number
U.S. Department of Energy
Division of Materials Sciences and Engineering

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abstract = "We report on growth and ferroelectric (FE) properties of superlattices (SLs) composed of the FE BaTiO3 and the paraelectric CaTiO3. Previous theories have predicted that the polarization in (BaTiO3) n/ (CaTiO3) n SLs increases as the sublayer thickness (n) increases when the same strain state is maintained. However, our BaTiO3 / CaTiO3 SLs show a varying lattice-strain state and systematic reduction in polarization with increasing n while coherently strained SLs with n=1 and 2 show a FE polarization of ca. 8.5 μC/ cm2. We suggest that the strain coupling plays a more important role in FE properties than the electrostatic interlayer coupling based on constant dielectric permittivities.",

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AB - We report on growth and ferroelectric (FE) properties of superlattices (SLs) composed of the FE BaTiO3 and the paraelectric CaTiO3. Previous theories have predicted that the polarization in (BaTiO3) n/ (CaTiO3) n SLs increases as the sublayer thickness (n) increases when the same strain state is maintained. However, our BaTiO3 / CaTiO3 SLs show a varying lattice-strain state and systematic reduction in polarization with increasing n while coherently strained SLs with n=1 and 2 show a FE polarization of ca. 8.5 μC/ cm2. We suggest that the strain coupling plays a more important role in FE properties than the electrostatic interlayer coupling based on constant dielectric permittivities.

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Strain-coupled ferroelectric polarization in BaTiO3 - CaTiO3 superlattices

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