Abstract
Dielectric response of epitaxial thin films of perovskite ${\mathrm{Ba}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{TiO}}_{3},x=0$, 0.2, 0.6, was experimentally studied as a function of temperature, frequency, and amplitude of ac electric field. Decrease of temperatures of dielectric maxima ${T}_{m}$ with respect to those in bulk, Curie-Weiss behavior above ${T}_{m}$, and ferroelectriclike behavior around ${T}_{m}$ were found to coexist with relaxorlike behavior below ${T}_{m}$. The results are discussed in terms of the frustrated transition between two ferroelectric phases in the films.
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