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| Naji, M. |
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| Ertürk, Emre |
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| Azevedo, Nuno Monteiro |
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Smith, Anders
Villum Fonden
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (6/6 displayed)
- 2012On the origin of metallic conductivity at the interface of LaAlO3/SrTiO3citations
- 2012Resistance switching of the interfacial conductance in amorphous SrTiO3 heterostructures
- 2012Development and Experimental Results from a 1 kW Prototype AMR
- 2011A monolithic perovskite structure for use as a magnetic regeneratorcitations
- 2010Structural and magnetic properties of Gd/Fe multilayers grown by pulsed laser deposition
- 2009Structural and magnetic properties of Gd/Fe multilayers grown by pulsed laser deposition
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article
On the origin of metallic conductivity at the interface of LaAlO3/SrTiO3
Abstract
To determine the origin of the quasi-two-dimensional electron gas formed at the interface between the two complex oxides of LaAlO3 (LAO) and SrTiO3 (STO), various amorphous films of LAO, La2O3, Al2O3, and La7/8Sr1/8MnO3 (LSMO), were deposited on TiO2-terminated (0 0 1) STO substrates by pulsed laser deposition at room temperature. Metallic interfaces are observed when the over-layers are amorphous LAO, La2O3, or Al2O3, while insulating interfaces are observed when the over-layer is LSMO. The interfacial conductivity of these SrTiO3-based hetero-structures shows strong dependence on both film thickness and oxygen pressure during film growth. The possible origin for the occurrence of metallic interfaces in these complex oxide hetero-structures due to redox reactions at the STO substrate surface is discussed. A thermodynamic criterion for designing either metallic or insulating interfaces between complex oxides is proposed.