Publication Date:
2006-09-16
Description:
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 approximately 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.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉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, 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 -- New York, N.Y. -- Science. 2006 Sep 15;313(5793):1614-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics, Pennsylvania State University, University Park, PA 16802, USA. dmitritenne@boisestate.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16973874" target="_blank"〉PubMed〈/a〉
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
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Chemistry and Pharmacology
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Computer Science
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Medicine
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Natural Sciences in General
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Physics
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