Epitactic textures of fcc Al on icosahedral Al-Pd-Mn quasicrystal

Bolliger, B.; Дмитриенко, В. Е.; Erbudak, M.; Lüscher, R.; Nissen, H.‐U.; Kortan, A. R.

doi:10.1103/physrevb.63.052203

Cited by 55 publications

(49 citation statements)

References 20 publications

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“…Twinning in thick crystalline films or overlayers on top of quasicrystals appears to be quite general, based on the fact that it has been observed also in several different, but analogous, systems: PtAl ͑Ref. 3͒ and AuAl overlayers 2 on the tenfold surface of a decagonal quasicrystal, and Al films 17 and cubic alloy overlays 18 on the same fivefold surface studied here.…”

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confidence: 58%

Nucleation and growth of Ag films on a quasicrystalline AlPdMn surface

et al. 2003

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confidence: 58%

Nucleation and growth of Ag films on a quasicrystalline AlPdMn surface

et al. 2003

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“…There are reports of rotational epitaxy for different metals ͑Al, Ag, Fe, and Ni͒ grown on i-Al-Pd-Mn, where the adlayer forms as five crystalline domains reflecting the substrate symmetry and the formation of such domains results in the extra spots in the LEED pattern of metal films on the quasicrystalline surfaces. 6,26 The LEED patterns for 1.2 ML Na recorded at various electron energies ͑Fig. 2͒ do not show the presence of such multiple spots.…”

Section: Resultsmentioning

confidence: 99%

Quasiperiodic layers of free-electron metals studied using electron diffraction

et al. 2009

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Using electron diffraction, we show that free-electron metals, such as sodium and potassium, form a highly regular quasiperiodic monolayer on the fivefold surface of icosahedral Al-Pd-Mn and that the quasiperiodicity propagates up to the second layer in sodium. Our photoelectron spectroscopy results show that the quasicrystalline alkali-metal adlayer does not exhibit a pseudogap near the Fermi level thought to be characteristic for the electronic structure of quasicrystalline materials. Calculations based on density functional theory provide a model structure for the quasicrystalline alkali-metal monolayer and confirm the absence of a pseudogap. Disciplines Metallurgy CommentsThis article is from Physical Review B 79 (2009) Using electron diffraction, we show that free-electron metals, such as sodium and potassium, form a highly regular quasiperiodic monolayer on the fivefold surface of icosahedral Al-Pd-Mn and that the quasiperiodicity propagates up to the second layer in sodium. Our photoelectron spectroscopy results show that the quasicrystalline alkali-metal adlayer does not exhibit a pseudogap near the Fermi level thought to be characteristic for the electronic structure of quasicrystalline materials. Calculations based on density functional theory provide a model structure for the quasicrystalline alkali-metal monolayer and confirm the absence of a pseudogap.

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“…10 In comparison, pseudomorphism was not observed in studies of Al at or above coverages of 1 ML on a similar substrate, i-Al-Pd-Mn. 16 Formation of the pseudomorphic clusters in the former case was corroborated theoretically using a kinetic Monte Carlo ͑KMC͒ simulation of an appropriate "disordered bond network" lattice gas model. 17 An equally-important advantage of studying low coverages is that a wealth of information can be extracted about the kinetics of island nucleation and growth in the initial stages of film formation.…”

Section: Introductionmentioning

confidence: 88%

“…͓Other authors have recently used LJ parameters to generate the PES of various adsorbates on quasicrystals, successfully explaining experimental structures of equilibrated Al monolayers and noble gas monolayers. 16,29,30 Our work differs in that it focuses on the kinetics of formation of localized structure.͔ In our previous work, we identified a subset of physically-reasonable fivefold terminations of the Boudard model for bulk Al-Pd-Mn structure. We adopt one such termination here.…”

Section: A Potential Energy Surfacementioning

confidence: 99%

Nucleation and growth of Ag islands on fivefold Al-Pd-Mn quasicrystal surfaces: Dependence of island density on temperature and flux

et al. 2007

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Scanning tunneling microscopy (STM) has been used to investigate the nucleation and growth of Ag islands on the fivefold surface of an icosahedral Al-Pd-Mn quasicrystal. Analysis of the data as a function of deposition temperature, from 127 K to 300 K, reveals that island density is constant, while at higher temperature it decreases. To model this behavior, we first show that the potential energy surface describing bonding of Ag at various locations on the surface is complex, with a few sites acting as traps for clusters of adatoms. We then develop a rate equation model which incorporates enhanced nucleation at trap sites relative to nucleation at regular sites on terraces. It recovers the temperature dependence of the island density, plus previous flux-scaling data. Our model suggests that the critical size for both types of nucleation sites is large-corresponding to stable clusters of at least 6 Ag atoms-and that binding between atoms at trap sites is significantly stronger than at free terrace sites. The data and the model, combined, provide guidance about the conditions of temperature and flux under which saturation of trap sites can be expected. This, in turn, provides a general indicator of the conditions that may favor localized pseudomorphic growth at low coverage, here and in other systems. Scanning tunneling microscopy ͑STM͒ has been used to investigate the nucleation and growth of Ag islands on the fivefold surface of an icosahedral Al-Pd-Mn quasicrystal. Analysis of the data as a function of deposition temperature, from 127 K to 300 K, reveals that island density is constant, while at higher temperature it decreases. To model this behavior, we first show that the potential energy surface describing bonding of Ag at various locations on the surface is complex, with a few sites acting as traps for clusters of adatoms. We then develop a rate equation model which incorporates enhanced nucleation at trap sites relative to nucleation at regular sites on terraces. It recovers the temperature dependence of the island density, plus previous fluxscaling data. Our model suggests that the critical size for both types of nucleation sites is large-corresponding to stable clusters of at least 6 Ag atoms-and that binding between atoms at trap sites is significantly stronger than at free terrace sites. The data and the model, combined, provide guidance about the conditions of temperature and flux under which saturation of trap sites can be expected. This, in turn, provides a general indicator of the conditions that may favor localized pseudomorphic growth at low coverage, here and in other systems.

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Epitactic textures of fcc Al on icosahedral Al-Pd-Mn quasicrystal

Cited by 55 publications

References 20 publications

Nucleation and growth of Ag films on a quasicrystalline AlPdMn surface

Nucleation and growth of Ag films on a quasicrystalline AlPdMn surface

Quasiperiodic layers of free-electron metals studied using electron diffraction

Nucleation and growth of Ag islands on fivefold Al-Pd-Mn quasicrystal surfaces: Dependence of island density on temperature and flux

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