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    Université de Neuchâtel

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

    Despont, Laurent ; Koitzsch, Christian ; Clerc, Florian ; Aebi, Philipp ; Lichtensteiger, Céline ; Triscone, Jean-Marc ; Garcia de Abajo, F.J. ; Bousquet, E. ; Ghosez

    In: Despont, Laurent ; Institut de Physique, Université de Neuchâtel, Switzerland, 2006, vol. 73, no. 094110, p. 1-6

    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...