Conference paper · Journal article
On the origin of metallic conductivity at the interface of LaAlO3/SrTiO3
Department of Energy Conversion and Storage, Technical University of Denmark1
Electrofunctional materials, Department of Energy Conversion and Storage, Technical University of Denmark2
Secretariat, IT, Department of Energy Conversion and Storage, Technical University of Denmark3
Functional organic materials, Department of Energy Conversion and Storage, Technical University of Denmark4
Management, Department of Energy Conversion and Storage, Technical University of Denmark5
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.
| Language: | English |
|---|---|
| Year: | 2012 |
| Proceedings: | EMRS 2011 Spring Symposium J: Laser materials processing for micro and nano applications |
| ISSN: | 18735584 and 01694332 |
| Types: | Conference paper and Journal article |
| DOI: | 10.1016/j.apsusc.2012.01.117 |
| ORCIDs: | Chen, Yunzhong , Christensen, Dennis , Trier, Felix , Pryds, Nini , Smith, Anders and Linderoth, Søren |
