Ferroelectricity in nonstoichiometric SrTiO3 films studied by ultraviolet Raman spectroscopy

Title
Ferroelectricity in nonstoichiometric SrTiO3 films studied by ultraviolet Raman spectroscopy
Authors
D. A. TenneA. K. FarrarC. M. BrooksT. HeegJ. Schubert장호원C. W. BarkC. M. FolkmanC. B. EomD. G. Schlom
Keywords
SrTiO3; nonstoichiometric; ferroelectricity; ultraviolet Raman spectroscopy; polar regions; 2E21722
Issue Date
2010-10
Publisher
Applied physics letters
Citation
VOL 97, NO 14, 142901-1-142901-3
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/38008
ISSN
0003-6951
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