Electronic conductivity and structural distortion at the interface between insulators SrTiO3 and LaAlO3
J. -L. Maurice, C. Carretero, M. -J. Casanove, K. Bouzehouane, S. Guyard, É. Larquet, J. -P. Contour
Abstract
When insulator LaAlO3 is grown by epitaxy onto a TiO2-terminated 100 surface of insulator SrTiO3, the resulting system has a metallic character. This phenomenon has been associated with an electrostatic frustration at the interface, as 100 surfaces of SrTiO3 are neutral while those of LaAlO3 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.
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