Ferroelectricity in nonstoichiometric SrTiO3 films studied by ultraviolet Raman spectroscopy
- Ferroelectricity in nonstoichiometric SrTiO3 films studied by ultraviolet Raman spectroscopy
- D. A. Tenne; A. K. Farrar; C. M. Brooks; T. Heeg; J. Schubert; 장호원; C. W. Bark; C. M. Folkman; C. B. Eom; D. G. Schlom
- SrTiO3; nonstoichiometric; ferroelectricity; ultraviolet Raman spectroscopy; polar regions; 2E21722
- Issue Date
- Applied physics letters
- VOL 97, NO 14, 142901-1-142901-3
- Homoepitaxial Sr1+xTiO3+δ films with −0.2 ≤ x ≤ 0.25 grown by reactive molecular-beam epitaxy on SrTiO3 (001) substrates have been studied by ultraviolet Raman spectroscopy. Nonstoichiometry for strontium-deficient compositions leads to the appearance of strong first-order Raman scattering at low temperatures, which decreases with increasing temperature and disappears at about 350 K. This indicates the appearance of a spontaneous polarization with a paraelectric-to-ferroelectric transition temperature above room temperature. Strontium-rich samples also show a strong first-order Raman signal, but the peaks are significantly broader and exhibit a less pronounced temperature dependence, indicating a stronger contribution of the disorder-activated mechanism in Raman scattering.
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