Formation and short-range order of two-dimensional<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>Cu</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>Pd</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>monolayer surface alloys on<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>Ru</mml:mi><mml:mo>(</mml:mo><mml:mn>0001</mml:mn><mml:mo>)</mm

Hoster, Harry E.; Филоненко, Е. В.; Richter, B.; Behm, R. J.

doi:10.1103/physrevb.73.165413

Cited by 24 publications

(23 citation statements)

References 60 publications

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“…This finding is in perfect agreement with the recent STM results for a submonolayer Pd films on Ru͑0001͒. 25 In their STM analysis, Hoster et al 25 concluded that the first Pd monolayer grows as dendrite islands, which follow the hcp stacking of the substrate, but exhibit two different orientations on the same terrace. Though in that case, it was not possible to decide if the subsequent Pd monolayers assume an hcp or fcc packing.…”

Section: Surface Structure Determinationsupporting

confidence: 84%

“…26 Furthermore, atomic resolution scanning tunneling microscopy ͑STM͒ study of a submonolayer Pd film on Ru͑0001͒ showed no indication at all of Ru-Pd exchange and its incorporation was also excluded in consequence of annealing studies. 25 Thus, we can state that alloy formation and diffusion do not happen in Pd/ Ru͑0001͒ in the interval of LT up to at least 1000 K. If alloy formation is not present, we would expected no significant energy shifts in the XPS spectra, which is confirmed ͑constant BE͒ for the Ru photoelectron peaks ͓Figs. 2͑b͒ and 2͑d͔͒.…”

Section: A X-ray Photoelectron Spectroscopy Analysismentioning

confidence: 68%

“…21,22 Nevertheless, the structure of the Pd monolayers on Ru͑0001͒ is still an open question. Campbell et al 26 and more recently Hoster et al 25 speculate that the films have fcc structure, but without any structural determination. None of the previous works indicates clearly what type of crystalline structure Pd films form when grown on top of Ru͑0001͒.…”

Section: Introductionmentioning

confidence: 98%

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Surface structure determination of Pd ultrathin films on Ru(0001): Possible magnetic behavior

et al. 2007

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Nowadays, ultrathin films play a fundamental role in modern materials science and technology. Recently, several theoretical works indicate that the magnetic properties of Pd ultrathin films could be controlled by structural parameters of the film, and much work has been done to study induced magnetic properties of ultrathin Pd films grown on different substrates. For the epitaxy of Pd monolayers on Ru͑0001͒, it was not clear if Pd grows in an hcp or fcc structure and a detailed surface structure determination was not available for this system. In this study, Pd films with thicknesses ranging from submonolayer up to approximately 15 ML were grown on a Ru͑0001͒ single crystal substrate under UHV conditions, and the electronic structure, surface crystallography, and magnetism were investigated by multiple ͑experimental and theoretical͒ techniques: x-ray photoelectron spectroscopy and diffraction using conventional Mg K␣ and synchrotron radiation sources, lowand high-energy electron diffraction, magneto-optical Kerr effect measurements, and density-functional theory calculations. The electronic structure, surface crystallography, and magnetism of the Pd films are discussed in detail.

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Section: Surface Structure Determinationsupporting

confidence: 84%

Section: A X-ray Photoelectron Spectroscopy Analysismentioning

confidence: 68%

Section: Introductionmentioning

confidence: 98%

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Surface structure determination of Pd ultrathin films on Ru(0001): Possible magnetic behavior

et al. 2007

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“…High-resolution STM imaging at many different surface positions confirm that the incorporated Au atoms are distributed uniformly over the terraces, and no significant enrichment or depletion near ascending or descending edges is observed. This resembles the behaviour of Pt x Ru 1Àx /Ru(0001), [20] Pd x Ru 1Àx / Ru(0001), [21] and Cu x Pd 1Àx /Ru(0001), [40] and it confirms that the mobility of the surface atoms was high enough to drive the surface into a local two-dimensional (2D) equilibrium state. Apart from the locally clustered distribution, the atom distribution can be characterized as a 2D solid solution.…”

Section: Surface Alloy Formationsupporting

confidence: 71%

“…In analogy to the analyses in refs. [20,21,40], these include 1) compact multifold adsorption ensembles with different Au:Pt ratios and 2) the average numbers of Au (Pt) neighbours surrounding a given Pt (Au) atom. These statistics are useful to interpret variations in the adsorption properties due to (mixed) ensemble effects and electronic ligand effects, [14,37,53,54] respectively.…”

Section: Abundance Of Adsorption Sitesmentioning

confidence: 99%

Entropy Effects in Atom Distribution and Electrochemical Properties of Au_xPt_1−x/Pt(111) Surface Alloys

2010

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We report on the structural and electrochemical properties of Au(x)Pt(1-x) surface alloys prepared by Au vapour deposition onto Pt(111) followed by annealing to 1000 K. Driven by configurational entropy, Pt and Au atoms are distributed homogeneously over the surface. On the nm scale, however, atomically resolved scanning tunnelling microscopy images with chemical contrast reveal the formation of nm-sized Pt-rich and Au-rich aggregates, similar to the behaviour recently reported for Pd(x)Ru(1-x)/Ru(0001) [H. Hartmann, T. Diemant, A. Bergbreiter, J. Bansmann, H. E. Hoster, R. J. Behm, Surf. Sci. 2009, 603, 1439]. Based on the STM data, we determine the abundance of specific adsorption sites for different Au contents, and we derive effective pair interaction parameters that allow reproducing the lateral distribution in Monte Carlo simulations. Cyclic voltammograms of the surface alloys have many similarities with Pt(111). H(ad) and OH(ad) related features both decrease with increasing amount of Au. Both seem to adsorb only on Pt sites, but H(ad) requires smaller ensembles of Pt atoms than OH(ad). The onset potential for H(ad)-formation decreases with increasing Au content. This is can be explained by an effect of the Au atoms on the entropy of adsorption.

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Properties of Surface Alloys

Hoster¹

2013

Surface and Interface Science

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Formation and short-range order of two-dimensionalCuxPd1−xmonolayer surface alloys onRu(0001)

Cited by 24 publications

References 60 publications

Surface structure determination of Pd ultrathin films on Ru(0001): Possible magnetic behavior

Surface structure determination of Pd ultrathin films on Ru(0001): Possible magnetic behavior

Entropy Effects in Atom Distribution and Electrochemical Properties of Au_xPt_1−x/Pt(111) Surface Alloys

Properties of Surface Alloys

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Formation and short-range order of two-dimensionalCuxPd1−xmonolayer surface alloys onRu(0001)

Cited by 24 publications

References 60 publications

Surface structure determination of Pd ultrathin films on Ru(0001): Possible magnetic behavior

Surface structure determination of Pd ultrathin films on Ru(0001): Possible magnetic behavior

Entropy Effects in Atom Distribution and Electrochemical Properties of AuxPt1−x/Pt(111) Surface Alloys

Properties of Surface Alloys

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Entropy Effects in Atom Distribution and Electrochemical Properties of Au_xPt_1−x/Pt(111) Surface Alloys