【摘 要】
：
A pseudospin-phonon coupled model in double-time Greens function theory has been developed to investi- gate the dielectric susceptibility of the ferroelectric-d
【机 构】
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National Laboratory of Solid State Microstructures and Center for Materials Analysis, Nanjing Univer
论文部分内容阅读
A pseudospin-phonon coupled model in double-time Greens 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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