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20 April 2024

» arxiv » cond-mat/0511084

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Direct evidence for ferroelectric polar distortion in ultrathin lead titanate perovskite films
L. Despont ; C. Lichtensteiger ; C. Koitzsch ; C. Clerc ; M. G. Garnier ; F. J. Garcia de Abajo ; E. Bousquet ; Ph. Ghosez ; J.-M. Triscone ; P. Aebi ; PostScript ; PDF ; Other formats ;
Date:	3 Nov 2005
Subject:	Materials Science
Abstract:	X-ray photoelectron diffraction is used to directly probe the intra-cell polar atomic distortion and tetragonality associated with ferroelectricity in ultrathin epitaxial PbTiO3 films. Our measurements, combined with ab-initio calculations, unambiguously demonstrate non-centro-symmetry in films a few unit cells thick, imply that films as thin as 3 unit cells still preserve a ferroelectric polar distortion, and also show that there is no thick paraelectric dead layer at the surface.
Source:	arXiv, cond-mat/0511084
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