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Direct evidence for ferroelectric polar distortion in ultrathin lead titanate perovskite films
Auteur(s)
Despont, Laurent
Koitzsch, Christian
Clerc, Florian
Aebi, Philipp
Lichtensteiger, Céline
Triscone, Jean-Marc
Garcia de Abajo, F.J.
Bousquet, E.
Ghosez
Date de parution
2006
In
Despont, Laurent ; Institut de Physique, Université de Neuchâtel, Switzerland, American Physical Society (APS), 2006/73/094110/1-6
Résumé
X-ray photoelectron diffraction is used to directly probe the intracell polar atomic distortion and tetragonality associated with ferroelectricity in ultrathin epitaxial PbTiO<sub>3</sub> 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.
Identifiants
Type de publication
journal article
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