Sp. Li et al., DIELECTRIC RESPONSE IN FERROELECTRIC SUPERLATTICES, Philosophical magazine. B. Physics of condensed matter. Statistical mechanics, electronic, optical and magnetic, 76(1), 1997, pp. 47-57
The dielectric response of a ferroelectric multilayer, having a design
ed heterogeneity, has been studied near its phase transition range by
use of the Landau-Ginzburg theory. The coherent lattice coupling betwe
en ultrathin layers can be significantly strong, resulting in a broad
phase transition of the superlattice system as a whole. The thickness
of layers and their spatial distribution hold the keys for enhancing d
ielectric properties in a broad temperature range.