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Direct evidence for ferroelectric polar distortion in ultrathin lead titanate perovskite films

Publication date2006
Abstract

X-ray photoelectron diffraction is used to directly probe the intracell polar atomic distortion and tetragonality associated with ferroelectricity in ultrathin epitaxial PbTiO3 films. Our measurements, combined with ab initio calculations, unambiguously demonstrate noncentrosymmetry in films a few unit cells thick, imply that films as thin as three unit cells still preserve a ferroelectric polar distortion, and also show that there is no thick paraelectric dead layer at the surface.

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Citation (ISO format)
DESPONT, L. et al. Direct evidence for ferroelectric polar distortion in ultrathin lead titanate perovskite films. In: Physical review. B, Condensed matter and materials physics, 2006, vol. 73, n° 9. doi: 10.1103/PhysRevB.73.094110
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ISSN of the journal1098-0121
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