Ferroelectricity of Perovskites under Pressure*

\textit{Ab-initio} simulations and experimental techniques are combined to reveal that, unlike commonly accepted for more than 30 years, perovskites and related materials \emph{enhance} their ferroelectricity as hydrostatic pressure increases above a critical value [1]. This unexpected high-pressure ferroelectricity is different in nature from conventional ferroelectricity because it is driven by an original electronic effect rather by long-range interactions. [1]. Igor A. Kornev, L. Bellaiche, P. Bouvier, P.-E. Janolin, B. Dkhil, and J. Kreisel, Phys. Rev. Lett. 95, 196804 (2005)