Ferroelectricity in Strain-Free SrTiO3 Thin Films

Title
Ferroelectricity in Strain-Free SrTiO3 Thin Films
Authors
장호원A. KumarS. DenevM. D. BiegalskiP. MaksymovychC. W. BarkC. T. NelsonC. M. FolkmanS. H. BaekN. BalkeC. M. BrooksD. A. TenneD. G. SchlomL. Q. ChenX. Q. PanS. V. KalininV. GopalanC. B. Eom
Keywords
Ferroelectricity; SrTiO3 films; Relaxor; Nanopolar regions; 2E21110
Issue Date
2010-05
Publisher
Physical review letters
Citation
VOL 104, 197601-1-197601-4
Abstract
Biaxial strain is known to induce ferroelectricity in thin films of nominally nonferroelectric materials such as SrTiO3. By a direct comparison of the strained and strain-free SrTiO3 films using dielectric, ferroelectric, Raman, nonlinear optical and nanoscale piezoelectric property measurements, we conclude that all SrTiO3 films and bulk crystals are relaxor ferroelectrics, and the role of strain is to stabilize longerrange correlation of preexisting nanopolar regions, likely originating from minute amounts of unintentional Sr deficiency in nominally stoichiometric samples. These findings highlight the sensitive role of stoichiometry when exploring strain and epitaxy-induced electronic phenomena in oxide films, heterostructures, and interfaces.
URI
http://pubs.kist.re.kr/handle/201004/37405
ISSN
0031-9007
Appears in Collections:
KIST Publication > Article
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