Abstract
A pseudospin-phonon coupled model in double-time Green's function theory hasbeen developed to investigate the dielectric susceptibility of theferroelectric-dielectric superlattice BaTiO3/SrTiO3 (BTO/STO). Asthe pseudospin-pseudospin and pseudospin-phonon interactionsincrease, the dielectric susceptibility changes from a narrow shape into thestrong 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 susceptibilitywas sensitively adjusted around the transition temperature of strontiumtitanate, and at large pseudospin-pseudospin interaction in the BTO layer,the dielectric susceptibility was increased in the high-temperature regioncovering the tetragonal-cubic transition temperature of barium titanate. Acritical period of 10/10 in the BTO/STO superlattice has been obtained,which is in good agreement with the experimental data of 40 Å, for tenunit cells.
Published Version
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