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Peculiar Features of the Dielectric Response in Lead Scandium Tantalate Pb(Sc1/2Ta1/2)O3 Thin Films

  • Kyle Brinkman (a1), Alexander Tagantsev (a2), Vladimir Cherman (a3), Yongli Wang (a4), Nava Setter (a5), Stanislav Kamba (a6) and Jan Petzelt (a7)...
Abstract

An examination of the low temperature (20 K) dielectric permittivity revealed dispersion between the MHz and THz frequencies in both disordered and ordered Pb(Sc1/2Ta1/2)O3 (PST) thin films. The difference between the lattice contribution in the THz regime and that measured in the MHz regime at extremely low temperatures points to the peculiar contribution of polar regions which maintain their mobility on cooling. Experiments measuring the permittivity upon cooling under an electric bias field revealed an additional peculiar feature of polar regions in disordered PST thin films: the application of a DC field of 30kV/cm failed to induce a phase transition to a long range polar state.

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