Temperature-independent giant dielectric response in transitional BaTiO.sub.3./sub. thin films

0531759 - FZÚ 2021 RIV US eng J - Journal Article
Everhardt, A.S. - Denneulin, T. - Grünebohm, A. - Shao, Y.T. - Ondrejkovič, Petr - Zhou, S. - Domingo, N. - Catalan, G. - Hlinka, Jiří - Zuo, J.M. - Matzen, S. - Noheda, B.
Temperature-independent giant dielectric response in transitional BaTiO₃ thin films.
Applied Physics Reviews. Roč. 7, č. 1 (2020), s. 1-8, č. článku 011402. ISSN 1931-9401. E-ISSN 1931-9401
R&D Projects: GA MŠMT(CZ) EF16_019/0000760
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271
Keywords : thin films * ferroelectrics * dielectric properties * phase transitions
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 19.162, year: 2020
Method of publishing: Open access

We report a temperature-independent bridging state in thin films of chemically simple BaTiO3. A coexistence among tetragonal, orthorhombic, and their bridging low-symmetry phases are shown to induce continuous vertical polarization rotation, which recreates a smear in-transition state and leads to a giant temperature-independent dielectric response. The current material contains a ferroelectric state that is distinct from those at morphotropic phase boundaries and cannot be considered as ferroelectric crystals. We believe that other materials can be engineered in a similar way to contain a ferroelectric state with gradual change of structure, forming a class of transitional ferroelectrics. Similar mechanisms could be utilized in other materials to design low-power ferroelectrics, piezoelectrics, dielectrics, or shape-memory alloys, as well as efficient electro- and magnetocalorics.
Permanent Link: http://hdl.handle.net/11104/0310372