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Unexpectedly high Curie temperature in weakly strained ferroelectric film

Abstract : Polarized Raman spectra of the epitaxial Ba0.4Sr0.6TiO3 film grown on MgO substrate with thickness of 600nm were studied in a broad temperature range of 80-600K and the phase transition from paraelectric to tetragonal ferroelectric phase was observed at about 500K. This critical temperature is substantially higher than that calculated from the lattice-mismatch strain theory. In addition, the predicted from the theory low-temperature orthorhombic and rhombohedral phases were not observed. We ascribe the strengthening of the tetragonal ferroelectric phase to the effect of the interface-induced build-in electric field resulted from the interface-accumulated charges.
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Soumis le : vendredi 1 avril 2022 - 13:47:28
Dernière modification le : samedi 2 avril 2022 - 03:00:19




Anna G. Razumnaya, Alexey S. Mikheykin, Igor A. Lukyanchuk, Vladimir B. Shirokov, Yury I. Golovko, et al.. Unexpectedly high Curie temperature in weakly strained ferroelectric film. PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS, 2017, 254 (4), ⟨10.1002/pssb.201600413⟩. ⟨hal-03627579⟩



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