摘要We examine the validity of nonlinear thermodynamic models which incorporate the contribution of electrostatic coupling and interfacial space charge in ferroelectric-paraelectric bilayers. Inconsistency of the directions between build-in polarization and field is found. Evolution of ferroelectricity does not follow the variation in coupling strength between different layers. In addition, we observe that the field-induced polarization in the paraelectric layer deviates from the polarization derived by thermodynamic theory. These findings indicate that the current versions of thermodynamic models need to be modified.
Abstract：We examine the validity of nonlinear thermodynamic models which incorporate the contribution of electrostatic coupling and interfacial space charge in ferroelectric-paraelectric bilayers. Inconsistency of the directions between build-in polarization and field is found. Evolution of ferroelectricity does not follow the variation in coupling strength between different layers. In addition, we observe that the field-induced polarization in the paraelectric layer deviates from the polarization derived by thermodynamic theory. These findings indicate that the current versions of thermodynamic models need to be modified.
(Theory of crystal structure, crystal symmetry; calculations and modeling)
引用本文:
LIU Yang**,PENG Xing-Ping. Validity of Nonlinear Thermodynamic Models in Ferroelectric-Paraelectric Bilayers and Superlattices[J]. 中国物理快报, 2012, 29(5): 57701-057701.
LIU Yang**,PENG Xing-Ping. Validity of Nonlinear Thermodynamic Models in Ferroelectric-Paraelectric Bilayers and Superlattices. Chin. Phys. Lett., 2012, 29(5): 57701-057701.
2012, Vol. 29 
