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首页> 中文期刊> 《中国物理快报：英文版》 >Dielectric Characteristics and Layer Periodic Effects of Ferroelectric Superlattice BaTiO3/SrTiO3

Dielectric Characteristics and Layer Periodic Effects of Ferroelectric Superlattice BaTiO3/SrTiO3

         
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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 BaTiO3/SrTiO3 (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.

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  • 来源
    《中国物理快报：英文版》 |2001年第9期|1271-1274|共4页
  • 作者

    张建; 尹真; 张明生; 陈万春;

  • 作者单位

    National Laboratory of Solid State Microstructures and Center for Materials Analysis, Nanjing University, Nanjing 210093;

    National Laboratory of Solid State Microstructures and Center for Materials Analysis, Nanjing University, Nanjing 210093;

    National Laboratory of Solid State Microstructures and Center for Materials Analysis, Nanjing University, Nanjing 210093;

    Institute of Physics, Chinese Academy of Sciences, Beijing 100080;

  • 原文格式 PDF
  • 正文语种 chi
  • 中图分类 物理学;
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