Dielectric Characteristics and Layer Periodic Effects of Ferroelectric Superlattice BaTiO_(3)/SrTiO_(3)

作     者：ZHANG Jiang YIN Zhen ZHANG Ming-Sheng CHEN Wan-Chun 张建;尹真;张明生;陈万春

作者机构：National Laboratory of Solid State Microstructures and Center for Materials AnalysisNanjing UniversityNanjing 210093 Institute of PhysicsChinese Academy of SciencesBeijing 100080 

出 版 物：《Chinese Physics Letters》 (中国物理快报（英文版）)

年 卷 期：2001年第18卷第9期

页      面：1271-1274页

核心收录：

学科分类：080903[工学-微电子学与固体电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：Supported by the Climbing Project of National Commission of Science and Technology 

主　　题：dielectric susceptibility interaction 

摘      要：A pseudospin-phonon coupled model in double-time Green s function theory has been developed to investi- gate the dielectric susceptibility of the ferroelectric-dielectric superlattice BaTiO_(3)/SrTiO_(3) (BTO/STO). As the pseudospin-pseudospin and pseudospin-phonon interactions increase, the dielectric susceptibility changes from a narrow shape into the strong and broad shape with the peak shifting to a higher temperature region. With increasing pseudospin-phonon interaction in the BTO layer and at smallpseudospin-pseudospin interaction in BTO layer, the dielectric susceptibility was sensitively adjusted around the transition temperature of strontium titanate, and at large pseudospin-pseudospin interaction in the BTO layer, the dielectric susceptibility was increased in the high-temperature region covering the tetragonal-cubic transition temperature of barium titanate. A critical period of 10/I0 in the BTO/STO superlattice has been obtained, which is in good agreement with the experimental data of 40A, for ten unit cells.