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Kelvin Probe Force Microscopy Study of LaAlO3/SrTiO3 Heterointerfaces
Chalmers University of Technology, Göteborg.
Chalmers University of Technology, Göteborg.
Jönköping University, School of Education and Communication, HLK, Disciplinary Research. Jönköping University, School of Education and Communication, HLK, School Based Research, Sustainable Development and Science education.
NT-MDT Europe B.V., Eindhoven.
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2010 (English)In: Journal of Advanced Microscopy Research, ISSN 2156-7573, E-ISSN 2156-7581, Vol. 5, no 1, p. 26-30Article in journal (Refereed) Published
Abstract [en]

Surface potential distribution in ultra-thin (0.8-3.9 nm) LaAlO3 layers deposited on SrTiO3 substrates is studied. It is found that the potential distribution evolves from island-like to a homogeneous one with increasing LaAlO3 thickness. It is suggested that the observed islands are caused by locally enhanced concentration of mobile charge carriers at the interface that is in turn related to non-stoichiometry of the layers with thickness bellow 4 unit cells. Transition to a homogeneous potential distribution with increasing LAO thickness (≥ 4 unit cells) corresponds to the formation of a quasi-2-dimensional electron gas. The results agree with a percolation model explaining the insulator-to-metal transition that occurs at the LaAlO3/SrTiO3 heterointerface.

Place, publisher, year, edition, pages
2010. Vol. 5, no 1, p. 26-30
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Condensed Matter Physics
Identifiers
URN: urn:nbn:se:hj:diva-12683DOI: 10.1166/jamr.2010.1020Local ID: HLKSkolnäraISOAI: oai:DiVA.org:hj-12683DiVA, id: diva2:326751
Available from: 2010-06-24 Created: 2010-06-24 Last updated: 2017-12-12Bibliographically approved

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Gunnarsson, Robert

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