Electronic reconstruction at n-type SrTiO3/LaAlO3 interfaces

J. Verbeeck, S. Bals, A.N. Kravtsova, D. Lamoen, M. Luysberg, Mark Huijben, Augustinus J.H.M. Rijnders, Alexander Brinkman, Johannes W.M. Hilgenkamp, David H.A. Blank, G. van Tendeloo

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Electron-energy-loss spectroscopy (EELS) is used to investigate single layers of LaAlO3 grown on SrTiO3 having an n-type interface as well as multilayers of LaAlO3 and SrTiO3 in which both n- and p-type interfaces occur. Only minor changes in Ti valence at the n-type interface are observed. This finding seems to contradict earlier experiments for other SrTiO3/LaAlO3 systems where large deviations in Ti valency were assumed to be responsible for the conductivity of these interfaces. Ab initio calculations have been carried out in order to interpret our EELS results. Using the concept of Bader charges, it is demonstrated that the so-called polar discontinuity is mainly resolved by lattice distortions and to a far lesser extent by changes in valency for both single layer and multilayer geometries.
Original languageEnglish
Pages (from-to)085113-
JournalPhysical review B: Condensed matter and materials physics
Volume81
DOIs
Publication statusPublished - 2010

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Electron energy loss spectroscopy
Multilayers
electronics
energy dissipation
electron energy
Geometry
spectroscopy
discontinuity
Experiments
valence
deviation
conductivity
strontium titanium oxide
geometry

Keywords

  • METIS-269420
  • IR-72403

Cite this

@article{2d93d203542b4eb18247ba9e3216de70,
title = "Electronic reconstruction at n-type SrTiO3/LaAlO3 interfaces",
abstract = "Electron-energy-loss spectroscopy (EELS) is used to investigate single layers of LaAlO3 grown on SrTiO3 having an n-type interface as well as multilayers of LaAlO3 and SrTiO3 in which both n- and p-type interfaces occur. Only minor changes in Ti valence at the n-type interface are observed. This finding seems to contradict earlier experiments for other SrTiO3/LaAlO3 systems where large deviations in Ti valency were assumed to be responsible for the conductivity of these interfaces. Ab initio calculations have been carried out in order to interpret our EELS results. Using the concept of Bader charges, it is demonstrated that the so-called polar discontinuity is mainly resolved by lattice distortions and to a far lesser extent by changes in valency for both single layer and multilayer geometries.",
keywords = "METIS-269420, IR-72403",
author = "J. Verbeeck and S. Bals and A.N. Kravtsova and D. Lamoen and M. Luysberg and Mark Huijben and Rijnders, {Augustinus J.H.M.} and Alexander Brinkman and Hilgenkamp, {Johannes W.M.} and Blank, {David H.A.} and {van Tendeloo}, G.",
year = "2010",
doi = "10.1016/10.1103/PhysRevB.81.085113",
language = "English",
volume = "81",
pages = "085113--",
journal = "Physical review B: Condensed matter and materials physics",
issn = "1098-0121",
publisher = "American Physical Society",

}

Electronic reconstruction at n-type SrTiO3/LaAlO3 interfaces. / Verbeeck, J.; Bals, S.; Kravtsova, A.N.; Lamoen, D.; Luysberg, M.; Huijben, Mark; Rijnders, Augustinus J.H.M.; Brinkman, Alexander; Hilgenkamp, Johannes W.M.; Blank, David H.A.; van Tendeloo, G.

In: Physical review B: Condensed matter and materials physics, Vol. 81, 2010, p. 085113-.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Electronic reconstruction at n-type SrTiO3/LaAlO3 interfaces

AU - Verbeeck, J.

AU - Bals, S.

AU - Kravtsova, A.N.

AU - Lamoen, D.

AU - Luysberg, M.

AU - Huijben, Mark

AU - Rijnders, Augustinus J.H.M.

AU - Brinkman, Alexander

AU - Hilgenkamp, Johannes W.M.

AU - Blank, David H.A.

AU - van Tendeloo, G.

PY - 2010

Y1 - 2010

N2 - Electron-energy-loss spectroscopy (EELS) is used to investigate single layers of LaAlO3 grown on SrTiO3 having an n-type interface as well as multilayers of LaAlO3 and SrTiO3 in which both n- and p-type interfaces occur. Only minor changes in Ti valence at the n-type interface are observed. This finding seems to contradict earlier experiments for other SrTiO3/LaAlO3 systems where large deviations in Ti valency were assumed to be responsible for the conductivity of these interfaces. Ab initio calculations have been carried out in order to interpret our EELS results. Using the concept of Bader charges, it is demonstrated that the so-called polar discontinuity is mainly resolved by lattice distortions and to a far lesser extent by changes in valency for both single layer and multilayer geometries.

AB - Electron-energy-loss spectroscopy (EELS) is used to investigate single layers of LaAlO3 grown on SrTiO3 having an n-type interface as well as multilayers of LaAlO3 and SrTiO3 in which both n- and p-type interfaces occur. Only minor changes in Ti valence at the n-type interface are observed. This finding seems to contradict earlier experiments for other SrTiO3/LaAlO3 systems where large deviations in Ti valency were assumed to be responsible for the conductivity of these interfaces. Ab initio calculations have been carried out in order to interpret our EELS results. Using the concept of Bader charges, it is demonstrated that the so-called polar discontinuity is mainly resolved by lattice distortions and to a far lesser extent by changes in valency for both single layer and multilayer geometries.

KW - METIS-269420

KW - IR-72403

U2 - 10.1016/10.1103/PhysRevB.81.085113

DO - 10.1016/10.1103/PhysRevB.81.085113

M3 - Article

VL - 81

SP - 085113-

JO - Physical review B: Condensed matter and materials physics

JF - Physical review B: Condensed matter and materials physics

SN - 1098-0121

ER -