Abstract
Vertical capacitor heterostructures of (Ba,Sr)TiO3 thin films with different Ba:Sr ratios, microstructures, and thicknesses were grown by in situ pulsed laser deposition using MgO or Al2O3 substrates and La0.5Sr0.5CoO3 or Pt electrodes. The low-frequency dielectric response was experimentally studied as a function of frequency, temperature, and applied field. High-temperature Curie-Weiss behavior, temperature evolution of the dynamic dielectric nonlinearity, and dielectric hysteresis were observed and analyzed. The observed high-temperature relaxorlike state and relaxational nature of dielectric hysteresis are discussed.
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