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.
Original language | English (US) |
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Pages (from-to) | 1614-1616 |
Number of pages | 3 |
Journal | Science |
Volume | 313 |
Issue number | 5793 |
DOIs | |
State | Published - Sep 15 2006 |
All Science Journal Classification (ASJC) codes
- General