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Origin of giant dielectric response in ferroelectric thin film multilayers |
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| Authors: | M D Glinchuk E A Eliseev V A Stephanovich M G Karkut R Farhi L Jastrabik |
| Affiliation: | 1. Institute for Materials Sciences, NASC of Ukraine , Krjijanovskogo 3, 252180, Kiev, Ukraine;2. Institute of Physics of Semiconductors, NASC of Ukraine , Prosp. Nauki 45, 252650, Kiev, Ukraine;3. Laboratory of Condenced Matter Physics, University of Picardy , 80039, Amiens, France;4. Institute of Physics , Czech ASc, 162 00, Prague, Czech Republic |
| Abstract: | Abstract A thermodynamic theory of dielectric response in ferroelectric thin film multilayers is developed. The solution of Lame equation for static dielectric susceptibility has shown that susceptibility diverges at the transition temperature of the thickness induced ferroelectric phase. This divergence is shown to be the origin of the giant dielectric response observed in some multilayers. The theory gives an excellent fit to the temperature dependence of the giant susceptibility observed recently in multilayers of PbTiO3-Pb1-xLaxTiO3 (x = 0.28). |
| Keywords: | susceptibility polarization phase transition ferroelectric film |