On the origin of metallic conductivity at the interface of LaAlO3/SrTiO3

Publication: Research - peer-reviewConference article – Annual report year: 2012

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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.
Original languageEnglish
JournalApplied Surface Science
Publication date2012
Volume258
Issue23
Pages9242– 9245
ISSN0169-4332
DOIs
StatePublished

Conference

ConferenceEMRS 2011 Spring Symposium J: Laser materials processing for micro and nano applications
CountryFrance
CityNice
Period09/05/1113/05/11
CitationsWeb of Science® Times Cited: 2

Keywords

  • Complex oxides, Interface, Metal–insulator transition, SrTiO3 surface
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