Validity of Nonlinear Thermodynamic Models in Ferroelectric-Paraelectric Bilayers and Superlattices  

作　　者：LIU Yang PENG Xing-Ping 刘洋;朋兴平(Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education,Lanzhou University,Lanzhou 730000)

机构地区：[1]Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education,Lanzhou University,Lanzhou 730000

出　　处：《Chinese Physics Letters》2012年第5期221-224,共4页中国物理快报（英文版）

基　　金：Supported by the Major Project of Gansu Provincial Science and Technology Department(1102GKDD035).

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.

关 键 词：theory. THERMODYNAMIC FERROELECTRIC 

分 类 号：O17[理学—数学]