We fabricate epitaxial PbZr0.52Ti0.48O3/YBa2Cu 3O7-x submicron film ferroelectric/superconductor heterostructures on the single-crystal YAlO3+1%Nd2O3 substrate by the pulsed laser deposition technique. Frequency independent low loss tanδ=0.04 and dielectric constant of 950, high electric resistivity ρ (150kV/cm)=6×1011cm, remnant polarization of 32μC/cm2, no visible fatigue after 107 short bipolar pulses switching indicate excellent electrical performance of the new capacitor structure. The slight crystallite polar axis misalignment and depolarizing effect were found to be responsible for the shape of the apparent polarization loop. The only fitting parameter depolarizing coefficient N=2.37×10-4 gives the best fit between theory and experimental data and corresponds to prolate ellipsoidal shaped crystallites with the length-to-diameter ratio of 140.
All Science Journal Classification (ASJC) codes