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 languageEnglish
Article number146101
JournalPhysical Review Letters
Volume103
Issue number14
Number of pages4
ISSN0031-9007
DOIs
Publication statusPublished - 2 Oct 2009
Externally publishedYes

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Kalabukhov, Alexey ; Boikov, Yu.A. ; Serenkov, I.T. ; Sakharov, V.I. ; Popok, Vladimir ; Gunnarson, R. ; Borjesson, J. ; Ljustina, N. ; Olsson, E. ; Winkler, Dag ; Claeson, Tord. / Cationic Disorder and Phase Segregation in LaAlO3/SrTiO3 Heterointerfaces Evidenced by Medium-Energy Ion Spectroscopy. In: Physical Review Letters. 2009 ; Vol. 103, No. 14.
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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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Kalabukhov, A, Boikov, YA, Serenkov, IT, Sakharov, VI, 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, vol. 103, no. 14, 146101. https://doi.org/10.1103/PhysRevLett.103.146101

Cationic Disorder and Phase Segregation in LaAlO3/SrTiO3 Heterointerfaces Evidenced by Medium-Energy Ion Spectroscopy. / Kalabukhov, Alexey; Boikov, Yu.A.; Serenkov, I.T.; Sakharov, V.I.; Popok, Vladimir; Gunnarson, R.; Borjesson, J.; Ljustina, N.; Olsson, E.; Winkler, Dag; Claeson, Tord.

In: Physical Review Letters, Vol. 103, No. 14, 146101, 02.10.2009.

Research output: Contribution to journalJournal articleResearchpeer-review

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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

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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.

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