Pramana

, Volume 70, Issue 2, pp 263–270 | Cite as

A first-principles study of phase transitions in ultrathin films of BaTiO3

  • J. Paul
  • T. Nishimatsu
  • Y. Kawazoe
  • U. V. Waghmare
Article

Abstract

We determine the effects of film thickness, epitaxial strain and the nature of electrodes on ferroelectric phase transitions in ultrathin films of BaTiO3 using a first-principles effective Hamiltonian in classical molecular dynamics simulations. We present results for polarization and dielectric properties as a function of temperature and epitaxial strain, leading to size-dependent temperature-strain phase diagram for the films sandwiched between ‘perfect’ electrodes. In the presence of non-vanishing depolarization fields when non-ideal electrodes are used, we show that a stable stripe-domain phase is obtained at low temperatures. The electrostatic images in the presence of electrodes and their interaction with local dipoles in the film explain these observed phenomena.

Keywords

Ferroelectric phase transition polarization epitaxial strain electrodes 

PACS Nos

77.90.+k 77.22.Ej 77.80.-e 

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Copyright information

© Indian Academy of Sciences 2008

Authors and Affiliations

  • J. Paul
    • 1
  • T. Nishimatsu
    • 2
    • 3
  • Y. Kawazoe
    • 2
  • U. V. Waghmare
    • 1
  1. 1.Theoretical Sciences UnitJawaharlal Nehru Centre for Advanced Scientific ResearchJakkur, BangaloreIndia
  2. 2.Institute for Materials ResearchTohoku UniversitySendaiJapan
  3. 3.Rutgers UniversityPiscatawayUSA

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