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Dielectric Characteristics and Layer Periodic Effects of Ferroelectric Superlattice BaTiO3/SrTiO3 |
| ZHANG Jiang1;YIN Zhen1;ZHANG Ming-Sheng1;CHEN Wan-Chun2 |
| 1National Laboratory of Solid State Microstructures and Center for Materials Analysis, Nanjing University, Nanjing 210093
2Institute of Physics, Chinese Academy of Sciences, Beijing 100080 |
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| Cite this article: |
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ZHANG Jiang, YIN Zhen, ZHANG Ming-Sheng et al 2001 Chin. Phys. Lett. 18 1271-1274 |
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Abstract A pseudospin-phonon coupled model in double-time Green's function theory has been developed to investigate dielectric susceptibility of the ferroelectric-dielectric superlattice BaTiO3/SrTiO3(BTO/STO). As the pseudospin-pseudospin interaction and the pseudospin-phonon interactions increase, the dielectric susceptibility changes from narrow shape into the strong-broad shape with the peak shift to higher temperature region. With increasing pseudospin-phonon interaction in the BTO layer and at small pseudospin-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 high temperature region covering the tetragonal-cubic transition temperature of barium titanate. A critical period of 10/10 in the BTO/STO superlattice has been obtained, which is in good agreement with experimental data of 40Å, for ten unit cells.
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| Keywords:
77.84.-s
63.20.Ls
77.84.Dy
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Published: 01 September 2001
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