Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/86793
Type: Artigo
Title: Atomic structure of Cr2O3/Ag(111) and Pd/Cr2O3/Ag(111) surfaces: a photoelectron diffraction investigation
Author: Kilian, Alex S.
Bernardi, Fabiano
Pancotti, Alexandre
Landers, Richard
Siervo, Abner de
Morais, Jonder
Abstract: A detailed investigation concerning the atomic structure of Cr2O3 and Pd/Cr2O3 ultrathin films deposited on a Ag(111) single crystal is presented. The films were prepared by MBE (molecular beam epitaxy) and characterized in situ by LEED (low energy electron diffraction), XPS (X-ray photoelectron spectroscopy), and XPD (X-ray photoelectron diffraction). Evidences of rotated domains and an oxygen-terminated Cr2O3/Ag(111) surface were observed, along with significant contractions of the oxides outermost interlayer distances. The deposition of Pd atoms on the Cr2O3 surface formed a four-monolayer film, fcc packed and oriented in the [111] direction, which presented changes in monolayer spacing and lateral atomic distance compared to the expected values for bulk Pd. The observed surface structure may shed light on new physical properties such as the induced magnetic ordering in Pd atoms.
A detailed investigation concerning the atomic structure of Cr2O3 and Pd/Cr2O3 ultrathin films deposited on a Ag(111) single crystal is presented. The films were prepared by MBE (molecular beam epitaxy) and characterized in situ by LEED (low energy electron diffraction), XPS (X-ray photoelectron spectroscopy), and XPD (X-ray photoelectron diffraction). Evidences of rotated domains and an oxygen-terminated Cr2O3/Ag(111) surface were observed, along with significant contractions of the oxide’s outermost interlayer distances. The deposition of Pd atoms on the Cr2O3 surface formed a four-monolayer film, fcc packed and oriented in the [111] direction, which presented changes in monolayer spacing and lateral atomic distance compared to the expected values for bulk Pd. The observed surface structure may shed light on new physical properties such as the induced magnetic ordering in Pd atoms.
Subject: Espectroscopia de fotoelétrons por raios-X
Filmes ultra-finos
Difração eletrônica em baixa energia
Country: Estados Unidos
Editor: American Chemical Society
Citation: Journal Of Physical Chemistry C. American Chemical Society, v. 118, n. 35, p. 20452 - 20460, 2014.
Rights: fechado
Identifier DOI: 10.1021/jp506507e
Address: https://pubs.acs.org/doi/abs/10.1021%2Fjp506507e
Date Issue: 2014
Appears in Collections:IFGW - Artigos e Outros Documentos

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