Journal
SURFACE SCIENCE
Volume 715, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.susc.2021.121937
Keywords
Strontium titanate; Surface reconstruction; X-ray photoelectron diffraction
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Funding
- Brazilian research agency Fundacao de Amparo a Pesquisa do Estado de Sao Paulo -FAPESP [2017/18574-4, 2017/25983-8]
- Brazilian research agency Conselho Nacional de Desenvolvimento Cientifico e Tecnologico -CNPq [310774/2020-9, 304119/2019-9, 302450/2017-3]
- Brazilian research agency CNPEM/LNLS
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The surface composition of a (root 5 x root 5)-R26.6 degrees reconstruction of a strontium titanate (001) single crystal was characterized by X-ray photoelectron spectroscopy, while its atomic surface structure was determined by a combination of low energy electron diffraction and X-ray photoelectron diffraction. Experimental and theoretical XPD results suggested that the surface reconstruction has two possible terminations: 40% SrO and 60% TiO2.
The surface composition of a (root 5 x root 5)-R26.6 degrees (Rt5) reconstruction of a strontium titanate (001) single crystal surface was characterized by X-ray photoelectron spectroscopy (XPS), and its atomic surface structure was determined by a combination of low energy electron diffraction (LEED) and X-ray photoelectron diffraction (XPD). The comparison between experimental and theoretical XPD results involving multiple scattering calculations indicated that the analyzed Rt5 reconstruction of the SrTiO3 (001) surface has two possible terminations: 40% of SrO and 60% of TiO2.
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