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Choi, Kyoung Jin
Energy Conversion Materials (EcoMAT) Lab
Research Interests
  • Solar cells, thermoelectrics, piezoelectric

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Probing nanoscale ferroelectricity by ultraviolet Raman spectroscopy

Cited 144 times inthomson ciCited 131 times inthomson ci
Title
Probing nanoscale ferroelectricity by ultraviolet Raman spectroscopy
Author
Tenne, D. A.Bruchhausen, A.Lanzillotti-Kimura, N. D.Fainstein, AKatiyar, R. S.Cantarero, A.Soukiassian, A.Vaithyanathan, V.Haeni, J. H.Tian, W.Schlom, D. G.Choi, Kyoung JinChoi, K. J.Kim, D. MEom, C. BSun, H. PPan, X. Q.Li, Y. L.Chen, L. Q.Jia, Q. X.Nakhmanson, S. M.Rabe, K. M.Xi, X. X
Keywords
THIN-FILMS; PEROVSKITE FILMS; ULTRATHIN FILMS; SRTIO3; SUPERLATTICES; PHONONS; POLARIZATION; ENHANCEMENT; BATIO3
Issue Date
200609
Publisher
AMER ASSOC ADVANCEMENT SCIENCE
Citation
SCIENCE, v.313, no.5793, pp.1614 - 1616
Abstract
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.
URI
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DOI
http://dx.doi.org/10.1126/science.1130306
ISSN
0036-8075
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