Al rich (111) and (110) surfaces of LaAlO3

Pratik Koirala, Elizabeth Steele, Ahmet Gulec, Laurence Marks*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Lanthanum aluminate (LaAlO3) has garnered significant interests since the discovery of a 2D electron gas at the LaAlO3/SrTiO3 interface. In this work, the (110) surface of LaAlO3 was studied using a combination of transmission electron microscopy plan and profile imaging, image simulation, electron diffraction, X-ray photoelectron spectroscopy, and density functional theory calculations. Profile imaging of the (110) surface was performed on a (111) oriented single crystalline sample with an Al rich surface. Our results indicate that high annealing temperatures (1000–1300 °C) commonly used in preparing well ordered, flat surfaces of LaAlO3 result in Al rich surfaces. The (110) surface was found to be single layered AlOx with a (2 × 1) reconstruction. Angle resolved X-ray photoelectron spectroscopy indicated that the (2 × 1) surface structure was not hydrated. Convex hull construction of surface enthalpies as a function of excess AlO1.5 on the (110) surface was done using density functional theory calculations.

Original languageEnglish (US)
Pages (from-to)99-104
Number of pages6
JournalSurface Science
Volume677
DOIs
StatePublished - Nov 2018

Keywords

  • Density functional theory
  • Lanthanum aluminate
  • Surface reconstruction
  • X-ray photoelectron spectroscopy

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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