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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On the origin of metallic conductivity at the interface of LaAlO3/SrTiO3. / Chen, Yunzhong; Christensen, Dennis ; Trier, Felix; Pryds, Nini; Smith, Anders; Linderoth, Søren.

In: Applied Surface Science, Vol. 258, No. 23, 2012, p. 9242– 9245.

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

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Author

Chen, Yunzhong; Christensen, Dennis ; Trier, Felix; Pryds, Nini; Smith, Anders; Linderoth, Søren / On the origin of metallic conductivity at the interface of LaAlO3/SrTiO3.

In: Applied Surface Science, Vol. 258, No. 23, 2012, p. 9242– 9245.

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

Bibtex

@article{a41cebb1520848ce8572bb25e71fd3e5,
title = "On the origin of metallic conductivity at the interface of LaAlO3/SrTiO3",
keywords = "Complex oxides, Interface, Metal–insulator transition, SrTiO3 surface",
publisher = "Elsevier BV North-Holland",
author = "Yunzhong Chen and Dennis Christensen and Felix Trier and Nini Pryds and Anders Smith and Søren Linderoth",
year = "2012",
doi = "10.1016/j.apsusc.2012.01.117",
volume = "258",
number = "23",
pages = "9242– 9245",
journal = "Applied Surface Science",
issn = "0169-4332",

}

RIS

TY - CONF

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

A1 - Chen,Yunzhong

A1 - Christensen,Dennis

A1 - Trier,Felix

A1 - Pryds,Nini

A1 - Smith,Anders

A1 - Linderoth,Søren

AU - Chen,Yunzhong

AU - Christensen,Dennis

AU - Trier,Felix

AU - Pryds,Nini

AU - Smith,Anders

AU - Linderoth,Søren

PB - Elsevier BV North-Holland

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

JO - Applied Surface Science

JF - Applied Surface Science

SN - 0169-4332

IS - 23

VL - 258

SP - 9242

EP - 9245

ER -