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RESEARCH PRODUCT

Probing Nanoscale Ferroelectricity by Ultraviolet Raman Spectroscopy

Andrés CantareroSerge NakhmansonQuanxi JiaKyoung Jin ChoiWei TianKarin M. RabeXiaoqing PanXiaoxing XiAxel BruchhausenArsen SoukiassianJ. H. HaeniAlejandro FainsteinD. A. TenneDarrell G. SchlomLong Qing ChenNorberto D. Lanzillotti-kimuraChang-beom EomHaiping SunV. VaithyanathanRam S. KatiyarD. M. KimYulan LiYulan Li

subject

MultidisciplinaryMaterials scienceNanostructureQuantum paraelectricityCondensed matter physicsPhononSuperlatticeAnalytical chemistryDielectricFerroelectricitychemistry.chemical_compoundsymbols.namesakechemistryStrontium titanatesymbolsRaman spectroscopy

description

We demonstrated that ultraviolet Raman spectroscopy is an effective technique to measure the transition temperature ( T c ) in ferroelectric ultrathin films and superlattices. We showed that one-unit-cell-thick BaTiO 3 layers in BaTiO 3 /SrTiO 3 superlattices are not only ferroelectric (with T c as high as 250 kelvin) but also polarize the quantum paraelectric SrTiO 3 layers adjacent to them. T c was tuned by ∼500 kelvin by varying the thicknesses of the BaTiO 3 and SrTiO 3 layers, revealing the essential roles of electrical and mechanical boundary conditions for nanoscale ferroelectricity.

yearjournalcountryeditionlanguage
2006-09-15Science
https://doi.org/10.1126/science.1130306