NDLI: Chemistry and structure of homoepitaxial SrTiO<sub>3</sub> films and their influence on oxide-heterostructure interfaces

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Inside back cover

Back cover

Nanoscale Vol - 6 Issue - 4

Nanoscale Vol - 6 Issue - 3

Chemistry and structure of homoepitaxial SrTiO₃ films and their influence on oxide-heterostructure interfaces

Content Provider	Royal Society of Chemistry (RSC)
Author	Pomjakushina, E. Leake, S. J. Cancellieri, C. Harrington, G. F. Willmott, P. R. Kilner, J. A. Cavallaro, A. Reinle-Schmitt, M. L.
Copyright Year	2014
Abstract	The properties of single-crystal SrTiO3 substrates and homoepitaxial SrTiO3 films grown by pulsed laser deposition have been compared, in order to understand the loss of interfacial conductivity when more than a critical thickness of nominally homoepitaxial SrTiO3 is inserted between a LaAlO3 film and a SrTiO3 substrate. In particular, the chemical composition and the structure of homoepitaxial SrTiO3 investigated by low-energy ion-scattering and surface X-ray diffraction show that for insulating heterointerfaces, a Sr-excess is present between the LaAlO3 and homoepitaxial SrTiO3. Furthermore, an increase in the out-of-plane lattice constant is observed in LaAlO3, indicating that the conductivity both with and without insertion of the SrTiO3 thin film originates from a Zener breakdown associated with the polar catastrophe. When more than a critical thickness of homoepitaxial SrTiO3 is inserted between LaAlO3 and SrTiO3, the electrons transferred by the electronic reconstruction are trapped by the formation of a Sr-rich secondary phase and Sr-vacancies. The migration of Sr towards the surface of homoepitaxial SrTiO3 and accompanying loss of interfacial conductivity can be delayed by reducing the Sr-content in the PLD target.
Starting Page	2598
Ending Page	2602
Page Count	5
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	6
Issue Number	5
Journal	Nanoscale
DOI	10.1039/c3nr06456e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	X-ray crystallography Zener effect Lattice constant Lanthanum aluminate Pulsed laser deposition
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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