Cationic Disorder and Phase Segregation in LaAlO3/SrTiO3 Heterointerfaces Evidenced by Medium-Energy Ion Spectroscopy

Alexey Kalabukhov; Yu.A. Boikov; I.T. Serenkov; V.I. Sakharov; Vladimir Popok; R. Gunnarson; J. Borjesson; N. Ljustina; E. Olsson; Dag Winkler; Tord Claeson

doi:10.1103/PhysRevLett.103.146101

Cationic Disorder and Phase Segregation in LaAlO3/SrTiO3 Heterointerfaces Evidenced by Medium-Energy Ion Spectroscopy

Alexey Kalabukhov, Yu.A. Boikov, I.T. Serenkov, V.I. Sakharov, Vladimir Popok, R. Gunnarson, J. Borjesson, N. Ljustina, E. Olsson, Dag Winkler, Tord Claeson

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Abstract

Medium-energy ion spectroscopy (MEIS) has been used to study the depth profile and deduce the distribution of possible cationic substitutions in LaAlO3/SrTiO3 (LAO/STO) heterointerfaces. Analysis of La and Sr peaks in aligned and random MEIS spectra indicates that the surface layers of LAO on an STO substrate are not homogeneous and stoichiometric if the film thickness is less than 4 unit cell layers. This is possibly caused by a redistribution of La and Sr at the interface. Kelvin probe force microscopy reveals an inhomogeneous distribution of the surface potential in a 4 unit cell LAO film, indicating micrometersized regions of different compositions. Our findings provide a novel view on the microstructural origin of the electrically conductive interfaces.

Original language	English
Article number	146101
Journal	Physical Review Letters
Volume	103
Issue number	14
Number of pages	4
ISSN	0031-9007
DOIs	https://doi.org/10.1103/PhysRevLett.103.146101
Publication status	Published - 2 Oct 2009
Externally published	Yes

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Kalabukhov, A., Boikov, Y. A., Serenkov, I. T., Sakharov, V. I., Popok, V., Gunnarson, R., Borjesson, J., Ljustina, N., Olsson, E., Winkler, D., & Claeson, T. (2009). Cationic Disorder and Phase Segregation in LaAlO3/SrTiO3 Heterointerfaces Evidenced by Medium-Energy Ion Spectroscopy. Physical Review Letters, 103(14), Article 146101. https://doi.org/10.1103/PhysRevLett.103.146101

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abstract = "Medium-energy ion spectroscopy (MEIS) has been used to study the depth profile and deduce the distribution of possible cationic substitutions in LaAlO3/SrTiO3 (LAO/STO) heterointerfaces. Analysis of La and Sr peaks in aligned and random MEIS spectra indicates that the surface layers of LAO on an STO substrate are not homogeneous and stoichiometric if the film thickness is less than 4 unit cell layers. This is possibly caused by a redistribution of La and Sr at the interface. Kelvin probe force microscopy reveals an inhomogeneous distribution of the surface potential in a 4 unit cell LAO film, indicating micrometersized regions of different compositions. Our findings provide a novel view on the microstructural origin of the electrically conductive interfaces.",

author = "Alexey Kalabukhov and Yu.A. Boikov and I.T. Serenkov and V.I. Sakharov and Vladimir Popok and R. Gunnarson and J. Borjesson and N. Ljustina and E. Olsson and Dag Winkler and Tord Claeson",

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T1 - Cationic Disorder and Phase Segregation in LaAlO3/SrTiO3 Heterointerfaces Evidenced by Medium-Energy Ion Spectroscopy

AU - Kalabukhov, Alexey

AU - Boikov, Yu.A.

AU - Serenkov, I.T.

AU - Sakharov, V.I.

AU - Popok, Vladimir

AU - Gunnarson, R.

AU - Borjesson, J.

AU - Ljustina, N.

AU - Olsson, E.

AU - Winkler, Dag

AU - Claeson, Tord

PY - 2009/10/2

Y1 - 2009/10/2

N2 - Medium-energy ion spectroscopy (MEIS) has been used to study the depth profile and deduce the distribution of possible cationic substitutions in LaAlO3/SrTiO3 (LAO/STO) heterointerfaces. Analysis of La and Sr peaks in aligned and random MEIS spectra indicates that the surface layers of LAO on an STO substrate are not homogeneous and stoichiometric if the film thickness is less than 4 unit cell layers. This is possibly caused by a redistribution of La and Sr at the interface. Kelvin probe force microscopy reveals an inhomogeneous distribution of the surface potential in a 4 unit cell LAO film, indicating micrometersized regions of different compositions. Our findings provide a novel view on the microstructural origin of the electrically conductive interfaces.

AB - Medium-energy ion spectroscopy (MEIS) has been used to study the depth profile and deduce the distribution of possible cationic substitutions in LaAlO3/SrTiO3 (LAO/STO) heterointerfaces. Analysis of La and Sr peaks in aligned and random MEIS spectra indicates that the surface layers of LAO on an STO substrate are not homogeneous and stoichiometric if the film thickness is less than 4 unit cell layers. This is possibly caused by a redistribution of La and Sr at the interface. Kelvin probe force microscopy reveals an inhomogeneous distribution of the surface potential in a 4 unit cell LAO film, indicating micrometersized regions of different compositions. Our findings provide a novel view on the microstructural origin of the electrically conductive interfaces.

U2 - 10.1103/PhysRevLett.103.146101

DO - 10.1103/PhysRevLett.103.146101

M3 - Journal article

SN - 0031-9007

VL - 103

JO - Physical Review Letters

JF - Physical Review Letters

IS - 14

M1 - 146101

ER -

Cationic Disorder and Phase Segregation in LaAlO3/SrTiO3 Heterointerfaces Evidenced by Medium-Energy Ion Spectroscopy

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