On the origin of metallic conductivity at the interface of LaAlO3/SrTiO3
Publication: Research - peer-review › Conference 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-review › Conference article – Annual report year: 2012
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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 -