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Title: ({radical}(13)x{radical}(13))R13.9 deg. and ({radical}(7)x{radical}(7))R19.1 deg. reconstructions of the polar SrTiO{sub 3} (111) surface

Abstract

Nb-doped SrTiO{sub 3} (111) samples are annealed in UHV at 850 deg. C for 30 min and investigated using scanning tunneling microscopy (STM), low-energy electron diffraction (LEED), and Auger electron spectroscopy (AES). STM images show that both ({radical}(7)x{radical}(7))R19.1 deg. and ({radical}(13)x{radical}(13))R13.9 deg. reconstructions coexist on the surface. Step heights of 0.21{+-}0.02 nm on the surface are equivalent to the d{sub 111} lattice parameter, which is the distance between two adjacent, similar (111) planes in the bulk crystal. The calculated LEED pattern for this co-reconstruction corresponds to the observed LEED pattern, which resembles a six-petal flower. AES analysis indicates no detectable impurities, and shows the surface to be Ti and Sr enriched and O deficient compared to the bulk stoichiometry. This change in surface composition is proposed to provide the stability for the polar surface.

Authors:
;  [1]
  1. Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH (United Kingdom)
Publication Date:
OSTI Identifier:
20957815
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 75; Journal Issue: 15; Other Information: DOI: 10.1103/PhysRevB.75.155433; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1098-0121
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANNEALING; AUGER ELECTRON SPECTROSCOPY; CRYSTALS; DISTANCE; DOPED MATERIALS; ELECTRON DIFFRACTION; IMAGES; LATTICE PARAMETERS; SCANNING TUNNELING MICROSCOPY; STOICHIOMETRY; STRONTIUM TITANATES; SURFACES

Citation Formats

Russell, Bruce C, and Castell, Martin R. ({radical}(13)x{radical}(13))R13.9 deg. and ({radical}(7)x{radical}(7))R19.1 deg. reconstructions of the polar SrTiO{sub 3} (111) surface. United States: N. p., 2007. Web. doi:10.1103/PHYSREVB.75.155433.
Russell, Bruce C, & Castell, Martin R. ({radical}(13)x{radical}(13))R13.9 deg. and ({radical}(7)x{radical}(7))R19.1 deg. reconstructions of the polar SrTiO{sub 3} (111) surface. United States. https://doi.org/10.1103/PHYSREVB.75.155433
Russell, Bruce C, and Castell, Martin R. 2007. "({radical}(13)x{radical}(13))R13.9 deg. and ({radical}(7)x{radical}(7))R19.1 deg. reconstructions of the polar SrTiO{sub 3} (111) surface". United States. https://doi.org/10.1103/PHYSREVB.75.155433.
@article{osti_20957815,
title = {({radical}(13)x{radical}(13))R13.9 deg. and ({radical}(7)x{radical}(7))R19.1 deg. reconstructions of the polar SrTiO{sub 3} (111) surface},
author = {Russell, Bruce C and Castell, Martin R},
abstractNote = {Nb-doped SrTiO{sub 3} (111) samples are annealed in UHV at 850 deg. C for 30 min and investigated using scanning tunneling microscopy (STM), low-energy electron diffraction (LEED), and Auger electron spectroscopy (AES). STM images show that both ({radical}(7)x{radical}(7))R19.1 deg. and ({radical}(13)x{radical}(13))R13.9 deg. reconstructions coexist on the surface. Step heights of 0.21{+-}0.02 nm on the surface are equivalent to the d{sub 111} lattice parameter, which is the distance between two adjacent, similar (111) planes in the bulk crystal. The calculated LEED pattern for this co-reconstruction corresponds to the observed LEED pattern, which resembles a six-petal flower. AES analysis indicates no detectable impurities, and shows the surface to be Ti and Sr enriched and O deficient compared to the bulk stoichiometry. This change in surface composition is proposed to provide the stability for the polar surface.},
doi = {10.1103/PHYSREVB.75.155433},
url = {https://www.osti.gov/biblio/20957815}, journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 15,
volume = 75,
place = {United States},
year = {Sun Apr 15 00:00:00 EDT 2007},
month = {Sun Apr 15 00:00:00 EDT 2007}
}