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

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

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.

Original languageEnglish
Article number017401
JournalPhysical Review Letters
Volume110
Issue number1
DOIs
StatePublished - Jan 3 2013

ASJC Scopus subject areas

  • General Physics and Astronomy

Fingerprint

Dive into the research topics of 'Oxygen-vacancy-induced orbital reconstruction of Ti ions at the interface of LaAlO3/SrTiO3 heterostructures: A resonant soft-x-ray scattering study'. Together they form a unique fingerprint.

Cite this