Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/4034
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Title: Dielectric response of temperature-graded ferroelectric films
Authors: Cao, HX
Lo, VC
Li, ZY
Issue Date: 1-Dec-2005
Source: Journal of applied physics, 1 Dec 2005, v. 98, no. 11, 114105, p. 1-6
Abstract: The dielectric susceptibility and dielectric tunability of the temperature-graded BaTiO₃thin films are investigated by using a modified transverse Ising model, taking the four-spin interaction and quantum fluctuation into account. There is a broad and smooth peak of the dielectric susceptibility at low temperature except for the sharp dielectric peak corresponding to the phase-transition temperature, irrespective of the sign of the temperature gradient. This behavior is different from the homogeneous bulk materials. Although the temperature gradient reduces the dielectric susceptibility, the temperature stability of the dielectric susceptibility can be effectively improved between the two dielectric peaks. The quantum fluctuation not only can enhance the temperature stability of the dielectric susceptibility but also has a significant influence on the dielectric tunability. Furthermore, a high dielectric tunability can be achieved by adjusting an appropriate positive temperature gradient, the quantum fluctuation strength, and the four-spin interaction strength.
Keywords: Barium compounds
Ferroelectric thin films
Lsing model
Optical susceptibility
Ferroelectric transitions
Publisher: American Institute of Physics
Journal: Journal of applied physics 
ISSN: 0021-8979
EISSN: 1089-7550
DOI: 10.1063/1.2138369
Rights: © 2005 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in H. X. Cao, V. C. Lo & Z. Y. Li, J. Appl. Phys. 98, 114105 (2005) and may be found at http://link.aip.org/link/?jap/98/114105.
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