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

Research output: Contribution to journalConference articleResearchpeer-review

465 Downloads (Pure)

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.
Original languageEnglish
JournalApplied Surface Science
Volume258
Issue number23
Pages (from-to)9242– 9245
ISSN0169-4332
DOIs
Publication statusPublished - 2012
EventEMRS 2011 Spring Symposium J: Laser materials processing for micro and nano applications - Nice, France
Duration: 9 May 201113 May 2011

Conference

ConferenceEMRS 2011 Spring Symposium J: Laser materials processing for micro and nano applications
CountryFrance
CityNice
Period09/05/201113/05/2011

Keywords

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

Fingerprint Dive into the research topics of 'On the origin of metallic conductivity at the interface of LaAlO3/SrTiO3'. Together they form a unique fingerprint.

Cite this