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 (LaAlO(3)/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.
authors: Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors: J
authors: J
authors: Park
authors: B-G
authors: BG
authors: Cho
authors: K D
authors: KD
authors: Kim
authors: J
authors: J
authors: Koo
authors: H
authors: H
authors: Jang
authors: K-T
authors: KT
authors: Ko
authors: J-H
authors: JH
authors: Park
authors: K-B
authors: KB
authors: Lee
authors: J-Y
authors: JY
authors: Kim
authors: D R
authors: DR
authors: Lee
authors: C A
authors: CA
authors: Burns
authors: S S A
authors: SS
authors: Seo
authors: H N
authors: HN
authors: Lee
mesh_terms: D000535:Aluminum / Q000737:chemistry; D002412:Cations / Q000737:chemistry; D007811:Lanthanum / Q000737:chemistry; D008956:Models, Chemical; D010087:Oxides / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D013324:Strontium / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction / Q000379:methods*
chemical_list: D002412:Cations; D010087:Oxides; D007811:Lanthanum; D000535:Aluminum; D014025:Titanium; C119252:strontium titanium oxide; D010100:Oxygen; D013324:Strontium