Low-energy electron diffraction structure determination of an ultrathin CoO film on Ag(001)

Schindler, K.‐M.; Wang, J.; Chassé, A.; Neddermeyer, H.; Widdra, W.

doi:10.1016/j.susc.2009.06.020

Cited by 22 publications

(14 citation statements)

References 21 publications

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“…9 Notably, for the related system CoO/Ag(001), a more recent quantitative LEED analysis of a 4 ML thick film derived very similar results. 22 There, an Ag-O interface bond length of 2.40Å was found in perfect agreement with this study. In addition, the topmost interlayer spacing was reported to be expanded by at least +5.6% as compared to the bulk spacing (2.25 vs 2.13Å, respectively), while the spacings between the deeper layer are almost bulklike.…”

Section: A Stress and Structure Of Nio Monolayerssupporting

confidence: 90%

Stress and structure at the NiO/Ag(001) interface

et al. 2011

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We present a combined stress and structural analysis of the growth of epitaxial NiO monolayers on Ag(001). Our experimental results indicate an unexpectedly complex interface formation, where a fraction of the first NiO monolayer (ML) is embedded into the Ag surface. This interface formation induces a tensile surface stress change. Subsequent deposition leads to a layer-by-layer growth of NiO up to 5 ML. Here, the average film stress is compressive −5.8 GPa, and it corresponds quantitatively to the misfit-induced stress. Our density functional calculations complement the experimental results by identifying the proper O-Ag bonding geometry in the ML regime from two indistinguishable options as provided by the analysis of surface x-ray diffraction data.

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Section: A Stress and Structure Of Nio Monolayerssupporting

confidence: 90%

Stress and structure at the NiO/Ag(001) interface

et al. 2011

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“…The latter peak position is closer to 2.0 eV observed in our work. We note that the STS values were obtained on Ag(1 0 0) where CoO films are strained [37]. Therefore, the values might not readily be comparable to our results for 4 ML of CoO on Ir(1 0 0).…”

Section: Coo(1 0 0)contrasting

confidence: 75%

Two-photon photoemission from CoO layers on Ir(1 0 0)

Otto

Fauster²

2016

J. Phys.: Condens. Matter

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Two-photon photoelectron spectroscopy is used to study the unoccupied electronic states of cobalt oxide layers on Ir(1 0 0). For thicker layers of (1 0 0) orientation the conduction band minimum is found 2 eV above the Fermi level. Layers with (1 1 1) orientation and thickness ≤4 bilayers show a peak around 3.4 eV energy and no evidence for the conduction band minimum. This is attributed to the metallic character of thin CoO(1 1 1) layers.

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“…Cobalt oxides have found interesting applications in many diverse fields of the advanced technologies, 8 and the epitaxial growth of Co oxide thin films has been reported on various metal substrates, such as Ag(100), [9][10][11][12][13] Ir(100), [14][15][16][17][18] and Pd(100). 8 have been described as a function of film thickness: while for thicker films (>10 ML) the oxide overlayers converge to the known bulk phases of CoO and/or Co 3 O 4 , the films in the ultrathin limit of 2D structures depend on the particular metal substrate and the thermodynamic and kinetic parameters of the deposition.…”

Section: Introductionmentioning

confidence: 99%

The two-dimensional cobalt oxide (9 × 2) phase on Pd(100)

Gragnaniello

Barcaro

Sementa

et al. 2011

The Journal of Chemical Physics

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The two-dimensional (2D) Co oxide monolayer phase with (9 × 2) structure on Pd(100) has been investigated experimentally by scanning tunneling microscopy (STM) and theoretically by density functional theory (DFT). The high-resolution STM images reveal a complex pattern which on the basis of DFT calculations is interpreted in terms of a coincidence lattice, consisting of a CoO(111)-type bilayer with significant symmetry relaxation and height modulations to reduce the polarity in the overlayer. The most stable structure displays an unusual zig-zag type of antiferromagnetic ordering. The (9 × 2) Co oxide monolayer is energetically almost degenerate with the c(4 × 2) monolayer phase, which is derived from a single CoO(100)-type layer with a Co(3)O(4) vacancy structure. Under specific preparation conditions, the (9 × 2) and c(4 × 2) structures can be observed in coexistence on the Pd(100) surface and the two phases are separated by a smooth interfacial boundary line, which has been analyzed at the atomic level by STM and DFT. The here described 2D Co oxide nanolayer systems are characterized by a delicate interplay of chemical, electronic, and interfacial strain interactions and the associated complexities in the theoretical description are emphasized and discussed.

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Low-energy electron diffraction structure determination of an ultrathin CoO film on Ag(001)

Cited by 22 publications

References 21 publications

Stress and structure at the NiO/Ag(001) interface

Stress and structure at the NiO/Ag(001) interface

Two-photon photoemission from CoO layers on Ir(1 0 0)

The two-dimensional cobalt oxide (9 × 2) phase on Pd(100)

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