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

Abstract

Lanthanum aluminate (LaAlO3) has garnered significant interests since the discovery of a 2D electron gas at the LaAlO3/SrTiO3 interface. Here 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.

Authors:
ORCiD logo [1];  [1];  [1];  [1]
  1. Northwestern University, Evanston, IL (United States)
Publication Date:
Research Org.:
Northwestern Univ., Evanston, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1609369
Alternate Identifier(s):
OSTI ID: 1548146
Grant/Contract Number:  
FG02-01ER45945; FG02 01ER45945
Resource Type:
Accepted Manuscript
Journal Name:
Surface Science
Additional Journal Information:
Journal Volume: 677; Journal Issue: C; Journal ID: ISSN 0039-6028
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; surface reconstruction; density functional theory; x-ray photoelectron spectroscopy; lanthanum aluminate

Citation Formats

Koirala, Pratik, Steele, Elizabeth, Gulec, Ahmet, and Marks, Laurence. Al rich (111) and (110) surfaces of LaAlO3. United States: N. p., 2018. Web. doi:10.1016/j.susc.2018.05.015.
Koirala, Pratik, Steele, Elizabeth, Gulec, Ahmet, & Marks, Laurence. Al rich (111) and (110) surfaces of LaAlO3. United States. https://doi.org/10.1016/j.susc.2018.05.015
Koirala, Pratik, Steele, Elizabeth, Gulec, Ahmet, and Marks, Laurence. Sat . "Al rich (111) and (110) surfaces of LaAlO3". United States. https://doi.org/10.1016/j.susc.2018.05.015. https://www.osti.gov/servlets/purl/1609369.
@article{osti_1609369,
title = {Al rich (111) and (110) surfaces of LaAlO3},
author = {Koirala, Pratik and Steele, Elizabeth and Gulec, Ahmet and Marks, Laurence},
abstractNote = {Lanthanum aluminate (LaAlO3) has garnered significant interests since the discovery of a 2D electron gas at the LaAlO3/SrTiO3 interface. Here 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.},
doi = {10.1016/j.susc.2018.05.015},
journal = {Surface Science},
number = C,
volume = 677,
place = {United States},
year = {2018},
month = {6}
}

Journal Article:

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Cited by: 3 works
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