Enhancement of dielectric and ferroelectric properties in ferroelectric superlattices

摘要

I studied theoretically the enhancement of remanent polarization and dielectric permittivity of interfacial-coupled ferroelectric superlattices based on the LandauGinzburg theory. Our model adopts the LandauKhalatnikov equation to describe hysteresis behavior and takes the time-dependent space-charge-limited conductivity into account to investigate the ferroelectric and dielectric properties of ferroelectric superlattices. The results are in good agreement with recent experimental observations on the enhancement of remanent polarization and permittivity of BaTiO_3SrTiO_3 superlattices and heterolayered Pb(Zr,Ti)O_3 thin films.