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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

Physics Faculty Publications and Presentations

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 CaTiO_{3 …}