High Mobility in LaAlO_3/SrTiO_3 Heterostructures: Origin, Dimensionality, and Perspectives

Herranz, G. and Basletić, Mario and Bibes, M. and Carretero, C. and Tafra, E. and Jacquet, E. and Bouzehouane, K. and Deranlot, C. and Hamzić, Amir and Broto, J.-M. and Barthelemy, A. and Fert, A. (2007) High Mobility in LaAlO_3/SrTiO_3 Heterostructures: Origin, Dimensionality, and Perspectives. Physical Review Letters, 98 (21). pp. 216803-4. ISSN 0031-9007

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We have investigated the dimensionality and origin of the magnetotransport properties of LaAlO3 films epitaxially grown on TiO2-terminated SrTiO3(001) substrates. High-mobility conduction is observed at low deposition oxygen pressures (PO2<10-5 mbar) and has a three-dimensional character. However, at higher PO2 the conduction is dramatically suppressed and nonmetallic behavior appears. Experimental data strongly support an interpretation of these properties based on the creation of oxygen vacancies in the SrTiO3 substrates during the growth of the LaAlO3 layer. When grown on SrTiO3 substrates at low PO2, other oxides generate the same high mobility as LaAlO3 films. This opens interesting prospects for all-oxide electronics.

Item Type: Article
Keywords: electronic transport in interface structures, diffusion of impurities, high-field and nonlinear effects
Date: May 2007
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2007) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119-1191458-1023
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 27 May 2014 16:17
Last Modified: 27 May 2014 16:17
URI: http://digre.pmf.unizg.hr/id/eprint/1807

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