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- W1994179628 abstract "Hyperferroelectricity is a new phenomenon discovered recently [Garrity et al., Phys. Rev. Lett. 112, 127601 (2014)]. Based on a fourth-order Ginzburg-Landau energy expansion, we formulate a physical constraint that hyferroelectrics must satisfy. The constraint leads to a nonzero polarization under the open-circuit boundary condition as well as a stable electric state as the minimum of the free energy. The theory further reveals a guide principle on the search for new hyferroelectrics, i.e., they need to have a deep potential well and a small zero-field polarization. In addition, we show that an unstable longitudinal optical phonon is a natural consequence of the constraint. Prototypical ferroelectric BaTiO3, PbTiO3, and KNbO3 do not meet the physical constraint, and are not hyperferroelectrics." @default.
- W1994179628 created "2016-06-24" @default.
- W1994179628 creator A5033470845 @default.
- W1994179628 date "2014-10-27" @default.
- W1994179628 modified "2023-10-18" @default.
- W1994179628 title "Physical constraint and its consequence for hyperferroelectrics" @default.
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- W1994179628 doi "https://doi.org/10.1063/1.4900480" @default.
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