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MSE Seminar - Professor Xiaoxing Xi, Department of Physics, The Pennsylvania State University
Friday, February 27, 2009
1:00 p.m.
Room 2108, Chemical and Nuclear Engineering Bldg.
For More Information:
Annette Mateus
301 405 5207

"Ferroelectricity at the Nanoscale"

Ferroelectricity at the nanoscale has emerged as fertile ground for new physical phenomena and devices. The advance in oxide thin film technology has allowed growth of nanoscale oxide ultrathin films and heterostructures with extremely high structural quality. As an example, I will present the results on nanoscale BaTiO3/SrTiO3 superlattices and ultrathin BaTiO3 films. In bulk, BaTiO3 is ferroelectric below 403 K and SrTiO3 is quantum paraelectric. Using ultraviolet Raman spectroscopy 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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