Ferroelectric Phase Transitions in Three-Component Short-Period Superlattices Studied by Ultraviolet Raman Spectroscopy

Dmitri Tenne, H. N. Lee, R. S. Katiyar, X. X. Xi

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Vibrational spectra of three-component BaTiO 3 SrTiO 3 CaTiO 3 short-period superlattices grown by pulsed laser deposition with atomic-layer control have been investigated by ultraviolet Raman spectroscopy. Monitoring the intensity of the first-order phonon peaks in Raman spectra as a function of temperature allowed determination of the ferroelectric phase transition temperature, T c . Raman spectra indicate that all superlattices remain in the tetragonal ferroelectric phase with out-of-plane polarization in the entire temperature range below T c . The dependence of T c on the relative thicknesses of ferroelectric (BaTiO 3 ) to non-ferroelectric materials (SrTiO 3 and CaTiO 3 ) has been studied. The highest T c was found in superlattices having the largest relative amount of BaTiO 3 , provided that the superlattice maintains its coherency with the substrate. Strain relaxation leads to a significant decrease in the ferroelectric phase transition temperature.

Original languageAmerican English
Article number054106
JournalPhysics Faculty Publications and Presentations
Volume105
Issue number5
DOIs
StatePublished - 9 Mar 2009

Keywords

  • Raman spectra
  • barium compounds
  • calcium compounds
  • dielectric polarisation
  • ferroelectric materials
  • ferroelectric transitions
  • phonons
  • pulsed laser deposition

EGS Disciplines

  • Physics

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