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Electronic conductivity and structural distortion at the interface between insulators SrTiO3and LaAlO3

✍ Scribed by Maurice, J.-L. ;Carrétéro, C. ;Casanove, M.-J. ;Bouzehouane, K. ;Guyard, S. ;Larquet, É. ;Contour, J.-P.

Book ID
105363679
Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
248 KB
Volume
203
Category
Article
ISSN
0031-8965

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✦ Synopsis

Abstract

When insulator LaAlO~3~ is grown by epitaxy onto a TiO~2~‐terminated {100} surface of insulator SrTiO~3~, the system obtained has a metallic character. This phenomenon has been associated with an electrostatic frustration at the interface, as {100} surfaces of SrTiO~3~ are neutral while those of LaAlO~3~ are polar, but its microscopic mechanism is not quite understood. Here, we present a structural characterisation of this interface by aberration‐corrected transmission electron microscopy. The unit cells at the interface appear elongated: we discuss this distortion in terms of electrostatic charge and extra carriers at the interface. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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