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Ferroelectricity of Perovskites under Pressure

2005; American Physical Society; Volume: 95; Issue: 19 Linguagem: Inglês

10.1103/physrevlett.95.196804

1092-0145

Igor Kornev, L. Bellaiche, Pierre Bouvier, Pierre‐Eymeric Janolin, Brahim Dkhil, Jens Kreisel,

Electronic and Structural Properties of Oxides

Ab initio simulations and experimental techniques are combined to reveal that, unlike what was commonly accepted for more than 30 years, perovskites and related materials enhance their ferroelectricity as hydrostatic pressure increases above a critical value. 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.