[en] 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.
Disciplines :
Physics
Author, co-author :
Despont, L.
Koitzsch, C.
Clerc, F.
Garnier, Manuela ; Centre Hospitalier Universitaire de Liège - CHU > Radiothérapie
Aebi, P.
Lichtensteiger, C.
Triscone, J. M.
Garcia de Abajo, F. J.
Bousquet, Eric ; Université de Liège - ULiège > Département de physique > Physique théorique des matériaux
Ghosez, Philippe ; Université de Liège - ULiège > Département de physique > Physique théorique des matériaux
Language :
English
Title :
Direct evidence for ferroelectric polar distortion in ultrathin lead titanate perovskite films
Publication date :
2006
Journal title :
Physical Review. B, Condensed Matter and Materials Physics
ISSN :
1098-0121
eISSN :
1550-235X
Publisher :
American Physical Society, Woodbury, United States - New York
scite shows how a scientific paper has been cited by providing the context of the citation, a classification describing whether it supports, mentions, or contrasts the cited claim, and a label indicating in which section the citation was made.
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