Carrier density modulation by structural distortions at modified LaAlO3/SrTiO3 interfaces

Schoofs, Frank and Carpenter, Michael A. and Vickers, Mary E. and Egilmez, Mehmet and Fix, Thomas and Kleibeuker, Josée E. and MacManus-Driscoll, Judith L. and Blamire, Mark G. (2013) Carrier density modulation by structural distortions at modified LaAlO3/SrTiO3 interfaces. Journal of Physics: Condensed Matter, 25 (17). p. 175005. ISSN 0953-8984 DOI https://doi.org/10.1088/0953-8984/25/17/175005

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Abstract

In order to study the fundamental conduction mechanism of LaAlO3/SrTiO3 (LAO/STO) interfaces, heterostructures were modified with a single unit cell interface layer of either an isovalent titanate ATiO3 (A = Ca, Sr, Sn, Ba) or a rare earth modified Sr0.5RE0.5TiO3 (RE = La, Nd, Sm, Dy) between the LAO and the STO. A strong coupling between the lattice strain induced in the LAO layer by the interfacial layers and the sheet carrier density in the STO substrate is observed. The observed crystal distortion of the LAO is large and it is suggested that it couples into the sub-surface STO, causing oxygen octahedral rotation and deformation. We propose that the ‘structural reconstruction’ which occurs in the STO surface as a result of the stress in the LAO is the enabling trigger for two-dimensional conduction at the LAO/STO interface by locally changing the band structure and releasing trapped carriers.

Item Type:	Article
Uncontrolled Keywords:	2013AREP; IA65;
Subjects:	03 - Mineral Sciences
Divisions:	03 - Mineral Sciences
Journal or Publication Title:	Journal of Physics: Condensed Matter
Volume:	25
Page Range:	p. 175005
Identification Number:	https://doi.org/10.1088/0953-8984/25/17/175005
Depositing User:	Sarah Humbert
Date Deposited:	03 May 2013 17:00
Last Modified:	23 Jul 2013 10:06
URI:	http://eprints.esc.cam.ac.uk/id/eprint/2763

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