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Title

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

Authors
Despont, L.
Koitzsch, C.
Clerc, F.
Garnier, M.
Aebi, P.
Garcia de Abajo, F.
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Published in Physical Review. B, Condensed Matter. 2006, vol. 73, no. 9
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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DESPONT, L. et al. Direct evidence for ferroelectric polar distortion in ultrathin lead titanate perovskite films. In: Physical Review. B, Condensed Matter, 2006, vol. 73, n° 9. https://archive-ouverte.unige.ch/unige:23540

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Deposited on : 2012-10-24

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