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

Yunzhong Chen; Dennis  Christensen; Felix Trier; Nini Pryds; Anders Smith; Søren Linderoth

doi:10.1016/j.apsusc.2012.01.117

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

Yunzhong Chen, Dennis Christensen, Felix Trier, Nini Pryds, Anders Smith, Søren Linderoth

Department of Energy Conversion and Storage

Research output: Contribution to journal › Conference article › Research › peer-review

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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 language	English
Journal	Applied Surface Science
Volume	258
Issue number	23
Pages (from-to)	9242– 9245
ISSN	0169-4332
DOIs	https://doi.org/10.1016/j.apsusc.2012.01.117
Publication status	Published - 2012
Event	EMRS 2011 Spring Symposium J: Laser materials processing for micro and nano applications - Nice, France Duration: 9 May 2011 → 13 May 2011

Conference

Conference	EMRS 2011 Spring Symposium J: Laser materials processing for micro and nano applications
Country/Territory	France
City	Nice
Period	09/05/2011 → 13/05/2011

Keywords

Complex oxides
Interface
Metal–insulator transition
SrTiO3 surface

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title = "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.",

keywords = "Complex oxides, Interface, Metal–insulator transition, SrTiO3 surface",

author = "Yunzhong Chen and Dennis Christensen and Felix Trier and Nini Pryds and Anders Smith and S{\o}ren Linderoth",

year = "2012",

doi = "10.1016/j.apsusc.2012.01.117",

language = "English",

volume = "258",

pages = "9242– 9245",

journal = "Applied Surface Science",

issn = "0169-4332",

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T1 - On the origin of metallic conductivity at the interface of LaAlO3/SrTiO3

AU - Chen, Yunzhong

AU - Christensen, Dennis

AU - Trier, Felix

AU - Pryds, Nini

AU - Smith, Anders

AU - Linderoth, Søren

PY - 2012

Y1 - 2012

N2 - 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.

AB - 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.

KW - Complex oxides

KW - Interface

KW - Metal–insulator transition

KW - SrTiO3 surface

U2 - 10.1016/j.apsusc.2012.01.117

DO - 10.1016/j.apsusc.2012.01.117

M3 - Conference article

SN - 0169-4332

VL - 258

SP - 9242

EP - 9245

JO - Applied Surface Science

JF - Applied Surface Science

IS - 23

T2 - EMRS 2011 Spring Symposium J: Laser materials processing for micro and nano applications

Y2 - 9 May 2011 through 13 May 2011

ER -

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

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Keywords

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