Unusual behavior of the ferroelectric polarization in PbTiO3/SrTiO3 superlattices

[en] Artificial PbTiO3/SrTiO3 superlattices were constructed using off-axis rf magnetron sputtering. X-ray diffraction and piezoelectric atomic force microscopy were used to study the evolution of the ferroelectric polarization as the ratio of PbTiO3 to SrTiO3 was changed. For PbTiO3 layer thicknesses larger than the 3-unit cell SrTiO3 thickness used in the structure, the polarization is found to be reduced as the PbTiO3 thickness is decreased. This observation confirms the primary role of the depolarization field in the polarization reduction in thin films. For the samples with ratios of PbTiO3 to SrTiO3 of less than one, a surprising recovery of ferroelectricity that cannot be explained by electrostatic considerations was observed.

Disciplines :

Physics

Author, co-author :

Dawber, M.

Lichtensteiger, C.

Cantoni, M.

Veithen, M.

Ghosez, Philippe ; Université de Liège - ULiège > Département de physique > Physique théorique des matériaux

Johnston, K.

Rabe, K. M.

Triscone, J. M.

Language :

English

Title :

Unusual behavior of the ferroelectric polarization in PbTiO3/SrTiO3 superlattices

Publication date :

21 October 2005

Journal title :

Physical Review Letters

ISSN :

0031-9007

eISSN :

1079-7114

Publisher :

American Physical Soc, College Pk, United States - Maryland

Volume :

Pages :

177601

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 02 December 2009

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