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Strong polarization enhancement in asymmetric three-component ferroelectric superlattices

Author

Listed:
  • Ho Nyung Lee

    (Oak Ridge National Laboratory)

  • Hans M. Christen

    (Oak Ridge National Laboratory)

  • Matthew F. Chisholm

    (Oak Ridge National Laboratory)

  • Christopher M. Rouleau

    (Oak Ridge National Laboratory)

  • Douglas H. Lowndes

    (Oak Ridge National Laboratory)

Abstract

Theoretical predictions—motivated by recent advances in epitaxial engineering—indicate a wealth of complex behaviour arising in superlattices of perovskite-type metal oxides. These include the enhancement of polarization by strain1,2 and the possibility of asymmetric properties in three-component superlattices3. Here we fabricate superlattices consisting of barium titanate (BaTiO3), strontium titanate (SrTiO3) and calcium titanate (CaTiO3) with atomic-scale control by high-pressure pulsed laser deposition on conducting, atomically flat strontium ruthenate (SrRuO3) layers. The strain in BaTiO3 layers is fully maintained as long as the BaTiO3 thickness does not exceed the combined thicknesses of the CaTiO3 and SrTiO3 layers. By preserving full strain and combining heterointerfacial couplings, we find an overall 50% enhancement of the superlattice global polarization with respect to similarly grown pure BaTiO3, despite the fact that half the layers in the superlattice are nominally non-ferroelectric. We further show that even superlattices containing only single-unit-cell layers of BaTiO3 in a paraelectric matrix remain ferroelectric. Our data reveal that the specific interface structure and local asymmetries play an unexpected role in the polarization enhancement.

Suggested Citation

  • Ho Nyung Lee & Hans M. Christen & Matthew F. Chisholm & Christopher M. Rouleau & Douglas H. Lowndes, 2005. "Strong polarization enhancement in asymmetric three-component ferroelectric superlattices," Nature, Nature, vol. 433(7024), pages 395-399, January.
  • Handle: RePEc:nat:nature:v:433:y:2005:i:7024:d:10.1038_nature03261
    DOI: 10.1038/nature03261
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    Cited by:

    1. Yifan Yuan & Michele Kotiuga & Tae Joon Park & Ranjan Kumar Patel & Yuanyuan Ni & Arnob Saha & Hua Zhou & Jerzy T. Sadowski & Abdullah Al-Mahboob & Haoming Yu & Kai Du & Minning Zhu & Sunbin Deng & Ra, 2024. "Hydrogen-induced tunable remanent polarization in a perovskite nickelate," Nature Communications, Nature, vol. 15(1), pages 1-11, December.
    2. Chao Yang & Rebecca Pons & Wilfried Sigle & Hongguang Wang & Eva Benckiser & Gennady Logvenov & Bernhard Keimer & Peter A. Aken, 2024. "Direct observation of strong surface reconstruction in partially reduced nickelate films," Nature Communications, Nature, vol. 15(1), pages 1-8, December.

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