Properties of the low-frequency phonon spectra of ferroelectric barium titanate-based heterostructures
Abstract
Polarized Raman spectra of the epitaxial Ba0.5Sr0.5TiO3 film, bi-color BaTiO3/Ba0.5Sr0.5TiO3 superlattice, and tri-color BaTiO3/Ba0.5Sr0.5TiO3/SrTiO3 superlattice were studied in a broad temperature range of 80-700 K. Based on the temperature dependence of the polar modes we determined the phase transitions temperatures in the studied heterostructures. In the sub-THz frequency range of the Y(XZ)Y spectra, we revealed the coexistence of the Debye-type central peak and soft mode in bi-color BaTiO3/Ba0.5Sr0.5TiO3 superlattice.
- Publication:
-
Ferroelectrics
- Pub Date:
- April 2019
- DOI:
- 10.1080/00150193.2019.1592446
- arXiv:
- arXiv:1910.02682
- Bibcode:
- 2019Fer...543...36G
- Keywords:
-
- Condensed Matter - Materials Science;
- Condensed Matter - Mesoscale and Nanoscale Physics
- E-Print:
- Ferroelectrics, 543, 36 (2019)