title: Lattice Strain Defects in a Ceria Nanolayer.
abstract: An ultrathin two-dimensional CeO2 (ceria) phase on a Cu(110) surface has been fabricated and fully characterized by high-resolution scanning tunneling microscopy, photoelectron spectroscopy, and density functional theory. The atomic lattice structure of the ceria/Cu(110) system is revealed as a hexagonal CeO2(111)-type monolayer separated from the Cu(110) surface by a partly disordered Cu-O intercalated buffer layer. The epitaxial coupling of the two-dimensional ceria overlayer to the Cu(110)-O surface leads to a nanoscopic stripe pattern, which creates defect regions of quasi-periodic lattice distortions. The symmetry and lattice mismatch at the interface is clarified to be responsible for the topographic stripe geometry and the related anisotropic strain defect regions at the ceria surface. This ceria monolayer is in a fully oxidized and thermodynamically stable state.
authors.affiliation: Surface and Interface Division, Institute of Physics, Karl-Franzens University , A-8010 Graz, Austria.
authors.forename: Liying
authors.initials: L
authors.lastname: Ma
authors.affiliation: Surface and Interface Division, Institute of Physics, Karl-Franzens University , A-8010 Graz, Austria.
authors.forename: Nassar
authors.initials: N
authors.lastname: Doudin
authors.affiliation: Surface and Interface Division, Institute of Physics, Karl-Franzens University , A-8010 Graz, Austria.
authors.forename: Svetlozar
authors.initials: S
authors.lastname: Surnev
authors.affiliation: CNR-ICCOM & IPCF , via G. Moruzzi 1, I-56124 Pisa, Italy.
authors.forename: Giovanni
authors.initials: G
authors.lastname: Barcaro
authors.affiliation: CNR-ICCOM & IPCF , via G. Moruzzi 1, I-56124 Pisa, Italy.
authors.forename: Luca
authors.initials: L
authors.lastname: Sementa
authors.affiliation: CNR-ICCOM & IPCF , via G. Moruzzi 1, I-56124 Pisa, Italy.
authors.forename: Alessandro
authors.initials: A
authors.lastname: Fortunelli
authors.affiliation: Surface and Interface Division, Institute of Physics, Karl-Franzens University , A-8010 Graz, Austria.
authors.forename: Falko P
authors.initials: FP
authors.lastname: Netzer
mesh_terms: D000327:Adsorption; D002563:Cerium / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D008958:Models, Molecular; D010084:Oxidation-Reduction; D056951:Photoelectron Spectroscopy; D013499:Surface Properties; D013816:Thermodynamics
chemical_list: D002563:Cerium; C030583:ceric oxide; D003300:Copper