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

Authors

Dmitri Tenne, Boise State UniversityFollow
H. N. Lee, Oak Ridge National Laboratory
R. S. Katiyar, University of Puerto Rico
X. X. Xi, Pennsylvania State University

Document Type

Article

Publication Date

3-9-2009

Abstract

Vibrational spectra of three-component BaTiO₃SrTiO₃CaTiO₃ 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 (BaTiO₃) to non-ferroelectric materials (SrTiO₃ and CaTiO₃) has been studied. The highest T_c was found in superlattices having the largest relative amount of BaTiO₃, provided that the superlattice maintains its coherency with the substrate. Strain relaxation leads to a significant decrease in the ferroelectric phase transition temperature.

Copyright Statement

This is an author-produced, peer-reviewed version of this article. The final, definitive version of this document can be found online at Journal of Applied Physics, published by American Institute of Physics. Copyright restrictions may apply. DOI: 10.1063/1.3087611

Publication Information

Tenne, Dmitri; Lee, H. N.; Katiyar, R. S.; and Xi, X. X.. (2009). "Ferroelectric Phase Transitions in Three-Component Short-Period Superlattices Studied by Ultraviolet Raman Spectroscopy". Journal of Applied Physics, 105(5), 054106-1 - 054106-5. http://dx.doi.org/10.1063/1.3087611