High temperature conductance characteristics of LaAlO3/ SrTiO3-heterostructures under equilibrium oxygen atmospheres

F. Gunkel; S. Hoffmann-Eifert; R. Dittmann; S. B. Mi; C. L. Jia; P. Meuffels; R. Waser

doi:10.1063/1.3457386

High temperature conductance characteristics of LaAlO₃/ SrTiO₃-heterostructures under equilibrium oxygen atmospheres

F. Gunkel
, S. Hoffmann-Eifert
, R. Dittmann
, S. B. Mi
, C. L. Jia
, P. Meuffels
, R. Waser

Jülich Research Centre

Research output: Contribution to journal › Article › peer-review

42 Scopus citations

Abstract

The interface conductance of LaAlO₃/SrTiO₃ heterostructures was investigated under high temperature oxygen equilibrium. The dependence of the heterostructure's conductance on oxygen partial pressure (from 10-22 to 1 bar) and temperature (800 to 1100 K) was compared to the characteristic of SrTiO₃ single crystals, which is described in terms of a defect chemistry model. Up to 950 K the equilibrated heterostructures reveal an additional influence of a metallic-like conduction path with a very slight dependence on the oxygen partial pressure. Donor-type interface states which may result from either lattice distortions or A-site cation intermixing during processing are discussed as a possible origin for the exceptional interface conduction of LaAlO₃/SrTiO₃ heterostructures.

Original language	English
Article number	012103
Journal	Applied Physics Letters
Volume	97
Issue number	1
DOIs	https://doi.org/10.1063/1.3457386
State	Published - 5 Jul 2010
Externally published	Yes

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title = "High temperature conductance characteristics of LaAlO3/ SrTiO3-heterostructures under equilibrium oxygen atmospheres",

abstract = "The interface conductance of LaAlO3/SrTiO3 heterostructures was investigated under high temperature oxygen equilibrium. The dependence of the heterostructure's conductance on oxygen partial pressure (from 10-22 to 1 bar) and temperature (800 to 1100 K) was compared to the characteristic of SrTiO3 single crystals, which is described in terms of a defect chemistry model. Up to 950 K the equilibrated heterostructures reveal an additional influence of a metallic-like conduction path with a very slight dependence on the oxygen partial pressure. Donor-type interface states which may result from either lattice distortions or A-site cation intermixing during processing are discussed as a possible origin for the exceptional interface conduction of LaAlO3/SrTiO3 heterostructures.",

author = "F. Gunkel and S. Hoffmann-Eifert and R. Dittmann and Mi, \{S. B.\} and Jia, \{C. L.\} and P. Meuffels and R. Waser",

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doi = "10.1063/1.3457386",

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T1 - High temperature conductance characteristics of LaAlO3/ SrTiO3-heterostructures under equilibrium oxygen atmospheres

AU - Gunkel, F.

AU - Hoffmann-Eifert, S.

AU - Dittmann, R.

AU - Mi, S. B.

AU - Jia, C. L.

AU - Meuffels, P.

AU - Waser, R.

PY - 2010/7/5

Y1 - 2010/7/5

N2 - The interface conductance of LaAlO3/SrTiO3 heterostructures was investigated under high temperature oxygen equilibrium. The dependence of the heterostructure's conductance on oxygen partial pressure (from 10-22 to 1 bar) and temperature (800 to 1100 K) was compared to the characteristic of SrTiO3 single crystals, which is described in terms of a defect chemistry model. Up to 950 K the equilibrated heterostructures reveal an additional influence of a metallic-like conduction path with a very slight dependence on the oxygen partial pressure. Donor-type interface states which may result from either lattice distortions or A-site cation intermixing during processing are discussed as a possible origin for the exceptional interface conduction of LaAlO3/SrTiO3 heterostructures.

AB - The interface conductance of LaAlO3/SrTiO3 heterostructures was investigated under high temperature oxygen equilibrium. The dependence of the heterostructure's conductance on oxygen partial pressure (from 10-22 to 1 bar) and temperature (800 to 1100 K) was compared to the characteristic of SrTiO3 single crystals, which is described in terms of a defect chemistry model. Up to 950 K the equilibrated heterostructures reveal an additional influence of a metallic-like conduction path with a very slight dependence on the oxygen partial pressure. Donor-type interface states which may result from either lattice distortions or A-site cation intermixing during processing are discussed as a possible origin for the exceptional interface conduction of LaAlO3/SrTiO3 heterostructures.

UR - https://www.scopus.com/pages/publications/77954738603

U2 - 10.1063/1.3457386

DO - 10.1063/1.3457386

M3 - 文章

AN - SCOPUS:77954738603

SN - 0003-6951

VL - 97

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 1

M1 - 012103

ER -

High temperature conductance characteristics of LaAlO₃/ SrTiO₃-heterostructures under equilibrium oxygen atmospheres

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