Probing nanoscale ferroelectricity by ultraviolet Raman spectroscopy
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- Probing nanoscale ferroelectricity by ultraviolet Raman spectroscopy
- Tenne, D. A.; Bruchhausen, A.; Lanzillotti-Kimura, N. D.; Fainstein, A; Katiyar, R. S.; Cantarero, A.; Soukiassian, A.; Vaithyanathan, V.; Haeni, J. H.; Tian, W.; Schlom, D. G.; Choi, Kyoung Jin; Choi, K. J.; Kim, D. M; Eom, C. B; Sun, H. P; Pan, X. Q.; Li, Y. L.; Chen, L. Q.; Jia, Q. X.; Nakhmanson, S. M.; Rabe, K. M.; Xi, X. X
- THIN-FILMS; PEROVSKITE FILMS; ULTRATHIN FILMS; SRTIO3; SUPERLATTICES; PHONONS; POLARIZATION; ENHANCEMENT; BATIO3
- Issue Date
- AMER ASSOC ADVANCEMENT SCIENCE
- SCIENCE, v.313, no.5793, pp.1614 - 1616
- We demonstrated that ultraviolet Raman spectroscopy is an effective technique to measure the transition temperature (Tc) in ferroelectric ultrathin films and superlattices. We showed that one-unit-cell-thick BaTiO3 layers in BaTiO3/SrTiO3 superlattices are not only ferroelectric (with Tc as high as 250 kelvin) but also polarize the quantum paraelectric SrTiO3 layers adjacent to them. Tc was tuned by ∼500 kelvin by varying the thicknesses of the BaTiO3 and SrTiO3 layers, revealing the essential roles of electrical and mechanical boundary conditions for nanoscale ferroelectricity.
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