Quantum Size Effects in Metal Thin Films Grown on Quasicrystalline Substrates

Fournée, V.; Sharma, H. R.; Shimoda, Masahiko; Tsai, A.‐P.; Ünal, Barış; Ross, A. R.; Lograsso, Thomas A.; Thiel, Patricia A.

doi:10.1103/physrevlett.95.155504

Cited by 72 publications

(95 citation statements)

References 26 publications

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“…This result is essentially identical to the earlier discovery of a preference for islands of height 4 atomic layers ͑AL͒ ͑and multiples thereof͒ when Bi is deposited on i-Al 63 Cu 24 Fe 13 ͑and Ag on i-Al 71 Pd 20 Mn 9 ͒. 15 The preference for 4 AL high islands was attributed to quantum size effects, where islands of specific height gain stability from the energetic location of the associated quantum well states. These effects are typically seen for metal overlayers on semiconducting substrates, where the quantum well states lie just below the Fermi level of the metal, and in the band gap of the substrate to ensure quantum confinement.…”

Section: Introductionsupporting

confidence: 77%

“…Previous STM results identified a considerable number of 2 AL islands on the surface just after deposition but these were found to erode over the course of an hour or so to form mostly 4 AL islands. 15 It is interesting to note that neither fit finds any occupation of 6 AL islands. The data are therefore consistent with the preference for multiples of 4 AL island heights as suggested in the earlier STM studies of Bi on i-Al-Cu-Fe ͑Ref.…”

Section: B Size Distribution Of Bi Islands At Higher Coveragementioning

confidence: 99%

“…14 The presence of multiples of 4 AL islands rather than 2 AL islands might suggest that the origin of these islands is related to quantum size effects as stated in the original work. 15 However, the fact that only even numbers of layers are preferred may indicate that another relevant factor is the formation of a bilayer type of structure, as reported for Bi growth on Si ͑111͒. 17,18 An investigation of the structure of the Bi islands was therefore carried out.…”

Section: B Size Distribution Of Bi Islands At Higher Coveragementioning

confidence: 99%

“…The search focused primarily on models having five rotational domains, since this is consistent with the symmetry seen with RHEED for Bi islands on i-Al-Cu-Fe. 15 Some evaluation of more obvious models with tenfold symmetry was also carried out. This was by no means exhaustive, because of the many possible models, but none of the tenfold models evaluated gave good agreement with the data.…”

Section: Structure Of the Bi Islandsmentioning

confidence: 99%

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Two- and three-dimensional growth of Bi oni-Al-Pd-Mn studied using medium-energy ion scattering

et al. 2010

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Recent work on the growth of thin metal films on quasicrystalline substrates has indicated the formation of so-called "magic height" islands with multiples of 4 atomic layers ͑AL͒ arising as a result of quantum size effects, which lead to enhanced stability. Here the results of a study are reported of Bi deposition on i-Al-Pd-Mn using medium-energy ion scattering to characterize the island thickness and the structural arrangement of Bi atoms within the islands. In addition, data were taken from annealed surfaces after Bi cluster desorption to leave a single aperiodic monolayer of Bi at the surface. Scattered-ion energy spectra from the Bi islands are consistent with a single Bi monolayer covered with mainly 4 AL islands for both 1.8 and 3.2 monolayer equivalent coverages but with some occupation of 2 and 8 Al islands as well. The angular dependence of the scattered-ion intensity ͑"blocking curve"͒ from Bi has been compared with simulations for various models of both rhombohedral Bi and a distorted "black-phosphorus"-like structure. The data demonstrate bilayer formation within the Bi islands. In the case of the aperiodic Bi monolayer, the blocking curves from substrate scattering are found to be inconsistent with two high-symmetry sites on the quasicrystalline surface that theory indicates are energetically favorable but do not exclude the formation of pentagonal arrangements of Bi atoms as seen in other recent experimental work.

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Section: Introductionsupporting

confidence: 77%

Section: B Size Distribution Of Bi Islands At Higher Coveragementioning

confidence: 99%

Section: B Size Distribution Of Bi Islands At Higher Coveragementioning

confidence: 99%

Section: Structure Of the Bi Islandsmentioning

confidence: 99%

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Two- and three-dimensional growth of Bi oni-Al-Pd-Mn studied using medium-energy ion scattering

et al. 2010

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“…These orientations, induced by the fivefold symmetry of the QC, can differ only by multiples of n · 12 • [24,25]. Since hexagons have sixfold symmetry, our systems can access only five possible orientations (6,18,30,42,54 • ), and the final angles are determined by the interplay between the adsorbate solid phase lattice spacing, the periodic simulation cell size, and the potential corrugation. For systems without periodic boundary conditions, the ground state has been found to be fivefold degenerate, as should be the case [24,25].…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Noble gas films on a decagonal AlNiCo quasicrystal

Diehl¹,

Ferralis²,

Cole³

et al. 2006

J. Phys.: Condens. Matter

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Abstract. Thermodynamic properties of Ne, Ar, Kr, and Xe adsorbed on an Al-NiCo quasicrystalline surface (QC) are studied with Grand Canonical Monte Carlo by employing Lennard-Jones interactions with parameter values derived from experiments and traditional combining rules. In all the gas/QC systems, a layer-by-layer film growth is observed at low temperature. The monolayers have regular epitaxial fivefold arrangements which evolve toward sixfold close-packed structures as the pressure is increased. The final states can contain either considerable or negligible amounts of defects. In the latter case, there occurs a structural transition from five to sixfold symmetry which can be described by introducing an order parameter, whose evolution characterizes the transition to be continuous or discontinuous as in the case of Xe/QC (first-order transition with associated latent heat). By simulating fictitious noble gases, we find that the existence of the transition is correlated with the size mismatch between adsorbate and substrate's characteristic lengths. A simple rule is proposed to predict the phenomenon.

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Quasicrystals and Complex Metallic Alloys

Dubois¹,

Belin-Ferré²,

Tsai

2016

Kirk-Othmer Encyclopedia of Chemical Technology

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With his famous discovery of quasicrystalline order in 1982–1984, Dan Shechtman, the 2011 Nobel Laureate for Chemistry, helped establish a fascinating field in materials science that has impacted also other fields in metallurgy, geology, polymer science, artificial nanostructured materials, low temperature physics, etc. The discovery forced scientists to deepen their understanding of structure and order of matter in nature and matter's properties; thereby suggesting new applications. In this article, the most salient features of this field are presented, beginning with a view of the different ways quasiperiodicity is expressed in solids, and explaining how atomic arrangements and electron transport properties may be described in aperiodic structures. Quasicrystals, as the ultimate degree of complexity in metallic compounds, are then discussed in the context of complex metallic alloys. Finally, two examples of applications—composites and catalysts—that take advantage of the specific electron transport and electron bonding in quasicrystals are mentioned.

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Quantum Size Effects in Metal Thin Films Grown on Quasicrystalline Substrates

Cited by 72 publications

References 26 publications

Two- and three-dimensional growth of Bi oni-Al-Pd-Mn studied using medium-energy ion scattering

Two- and three-dimensional growth of Bi oni-Al-Pd-Mn studied using medium-energy ion scattering

Noble gas films on a decagonal AlNiCo quasicrystal

Quasicrystals and Complex Metallic Alloys

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