Ferroelectric Bi_(3.25)La_(0.75)Ti_3O_(12) thin films on a conductive Sr_4Ru_2O_9 electrode obtained by pulsed laser deposition

摘要

Strontium ruthenate and Bi_(3.25)La_(0.75)Ti_3O_(12) (BLT) layers were grown on Si(100) substrate using pulsed laser deposition technique. Starting from a Sr_2RuO_4 target, we obtained single phase films composed of Sr_4Ru_2O_9; on these strontium ruthenate electrodes, textured and non-textured BLT were grown at 700℃. Structural characterizations of these double layers were done by X-ray diffraction, scanning electron microscopy, normal and high-resolution transmission electron microscopy. The Van der Pauw's resistivity measurements indicate that Sr_4Ru_2O_9 can be used as a back electrode. The temperature dependence of the resistivity at low temperatures is ρ(T) = ρ_0exp (T_0/T)~(1/2), which corresponds to a variable-range hopping mechanism.