Oxygen-vacancy-induced orbital reconstruction of Ti ions at the interface of LaAlO3/SrTiO3 heterostructures: A resonant soft-x-ray scattering study

J. Park; B. G. Cho; K. D. Kim; J. Koo; H. Jang; K. T. Ko; J. H. Park; K. B. Lee; J. Y. Kim; D. R. Lee; C. A. Burns; S. S.A. Seo; H. N. Lee

doi:10.1103/PhysRevLett.110.017401

Oxygen-vacancy-induced orbital reconstruction of Ti ions at the interface of LaAlO₃/SrTiO₃ heterostructures: A resonant soft-x-ray scattering study

J. Park, B. G. Cho, K. D. Kim, J. Koo, H. Jang, K. T. Ko, J. H. Park, K. B. Lee, J. Y. Kim, D. R. Lee, C. A. Burns, S. S.A. Seo, H. N. Lee

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Abstract

Resonant soft-x-ray scattering measurements have been performed to investigate interface electronic structures of (LaAlO₃/SrTiO ₃) superlattices. Resonant scattering intensities at superlattice reflections show clear evidence of degeneracy lifting in t_2g states of interface Ti ions. Polarization dependence of intensities indicates the energy of d_xy states is lower by ∼1 eV than two other t _2g states. The energy splitting is insensitive to epitaxial strain. The orbital reconstruction is induced by oxygen vacancies and confined to the interface within two unit cells, indicating charge compensation at the polar interfaces.

Original language	English
Article number	017401
Journal	Physical Review Letters
Volume	110
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevLett.110.017401
State	Published - Jan 3 2013

ASJC Scopus subject areas

Physics and Astronomy (all)

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10.1103/PhysRevLett.110.017401

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Park, J., Cho, B. G., Kim, K. D., Koo, J., Jang, H., Ko, K. T., Park, J. H., Lee, K. B., Kim, J. Y., Lee, D. R., Burns, C. A., Seo, S. S. A., & Lee, H. N. (2013). Oxygen-vacancy-induced orbital reconstruction of Ti ions at the interface of LaAlO₃/SrTiO₃ heterostructures: A resonant soft-x-ray scattering study. Physical Review Letters, 110(1), [017401]. https://doi.org/10.1103/PhysRevLett.110.017401

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title = "Oxygen-vacancy-induced orbital reconstruction of Ti ions at the interface of LaAlO3/SrTiO3 heterostructures: A resonant soft-x-ray scattering study",

abstract = "Resonant soft-x-ray scattering measurements have been performed to investigate interface electronic structures of (LaAlO3/SrTiO 3) superlattices. Resonant scattering intensities at superlattice reflections show clear evidence of degeneracy lifting in t2g states of interface Ti ions. Polarization dependence of intensities indicates the energy of dxy states is lower by ∼1 eV than two other t 2g states. The energy splitting is insensitive to epitaxial strain. The orbital reconstruction is induced by oxygen vacancies and confined to the interface within two unit cells, indicating charge compensation at the polar interfaces.",

author = "J. Park and Cho, {B. G.} and Kim, {K. D.} and J. Koo and H. Jang and Ko, {K. T.} and Park, {J. H.} and Lee, {K. B.} and Kim, {J. Y.} and Lee, {D. R.} and Burns, {C. A.} and Seo, {S. S.A.} and Lee, {H. N.}",

year = "2013",

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doi = "10.1103/PhysRevLett.110.017401",

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Park, J, Cho, BG, Kim, KD, Koo, J, Jang, H, Ko, KT, Park, JH, Lee, KB, Kim, JY, Lee, DR, Burns, CA, Seo, SSA & Lee, HN 2013, 'Oxygen-vacancy-induced orbital reconstruction of Ti ions at the interface of LaAlO₃/SrTiO₃ heterostructures: A resonant soft-x-ray scattering study', Physical Review Letters, vol. 110, no. 1, 017401. https://doi.org/10.1103/PhysRevLett.110.017401

TY - JOUR

T1 - Oxygen-vacancy-induced orbital reconstruction of Ti ions at the interface of LaAlO3/SrTiO3 heterostructures

T2 - A resonant soft-x-ray scattering study

AU - Park, J.

AU - Cho, B. G.

AU - Kim, K. D.

AU - Koo, J.

AU - Jang, H.

AU - Ko, K. T.

AU - Park, J. H.

AU - Lee, K. B.

AU - Kim, J. Y.

AU - Lee, D. R.

AU - Burns, C. A.

AU - Seo, S. S.A.

AU - Lee, H. N.

PY - 2013/1/3

Y1 - 2013/1/3

N2 - Resonant soft-x-ray scattering measurements have been performed to investigate interface electronic structures of (LaAlO3/SrTiO 3) superlattices. Resonant scattering intensities at superlattice reflections show clear evidence of degeneracy lifting in t2g states of interface Ti ions. Polarization dependence of intensities indicates the energy of dxy states is lower by ∼1 eV than two other t 2g states. The energy splitting is insensitive to epitaxial strain. The orbital reconstruction is induced by oxygen vacancies and confined to the interface within two unit cells, indicating charge compensation at the polar interfaces.

AB - Resonant soft-x-ray scattering measurements have been performed to investigate interface electronic structures of (LaAlO3/SrTiO 3) superlattices. Resonant scattering intensities at superlattice reflections show clear evidence of degeneracy lifting in t2g states of interface Ti ions. Polarization dependence of intensities indicates the energy of dxy states is lower by ∼1 eV than two other t 2g states. The energy splitting is insensitive to epitaxial strain. The orbital reconstruction is induced by oxygen vacancies and confined to the interface within two unit cells, indicating charge compensation at the polar interfaces.

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DO - 10.1103/PhysRevLett.110.017401

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Oxygen-vacancy-induced orbital reconstruction of Ti ions at the interface of LaAlO₃/SrTiO₃ heterostructures: A resonant soft-x-ray scattering study

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