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Gierer, M.; Hove, M.A. Van; Goldman, A. I.; Shen, Zukang; Chang, Shinn‐Liang; Jenks, Cynthia J.; Zhang, C.-M.; Thiel, Patricia A.

doi:10.1103/physrevlett.78.467

Cited by 154 publications

(91 citation statements)

References 13 publications

(18 reference statements)

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“…Al is enriched, while Pd is slightly depleted and Mn is substantially depleted. Evidence also exists from other studies of Al-based icosahedral quasicrystals that the composition of the topmost layer differs from the bulk composition, including studies using LEED [12,13], LEIS [12][13][14], and X-ray diffraction [21,22]. It is difficult to assess whether the altered surface composition is an intrinsic property of the material or has resulted from the cleaning procedure.…”

Section: Discussionmentioning

confidence: 94%

“…One real-space model of the i-Al-Pd-Mn 5-fold surface, which has been shown to be consistent with fine structure in STM data [17], is based on surface terminations of bulk pseudo Mackay icosahedral clusters that are adjusted to agree with dynamical LEED calculations of Gierer, et al [12,13]. The distances between Al surface atoms in this model have been tabulated and a number of preferred distances are found in their distribution.…”

Section: Discussionmentioning

confidence: 99%

“…But either process does not explain the enrichment of Al at the surface, which could be a characteristic property of the i-Al-Pd-Mn surface. Gierer, et al, found from dynamical LEED calculations based on the bulk structural model by Boudard, et al, that there appear to be favored surface terminations and that these favored terminations are all Al-rich [12,13,36].…”

Section: Discussionmentioning

confidence: 99%

“…Based upon data obtained with low energy electron diffraction (LEED) [9][10][11][12][13][14], scanning tunneling microscopy [10,[15][16][17][18], secondary electron imaging [19,20], surface X-ray diffraction [21,22] and X-ray photoelectron diffraction [23][24][25], the surface structure of i-Al-Pd-Mn appears quasicrystalline within the experimental resolution of these techniques. Dynamical LEED calculations for a 5-fold surface of i-Al-Pd-Mn by Gierer et al, suggest that the topmost layer of clean i-Al-Pd-Mn K11.1.1 prepared under ultrahigh vacuum (UHV) conditions through a combination of sputtering and annealing should be predominately Al (about 90 atomic percent Al and 10% Mn) with a second layer about 0.4Å below the first consisting of about 49% Al, 42% Pd and 9% Mn [12,13]. A similar relative contraction compared to the bulk was also obtained by surface X-ray diffraction for the same surface prepared under UHV conditions by high temperature annealing [21,22].…”

Section: Introductionmentioning

confidence: 99%

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Low-Energy Ion Scattering Measurements from an Al-Pd-Mn Quasicrystal

et al. 2000

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Energy-angle distributions of low-energy inert-gas ions scattered from surfaces provide information about surface composition and structure. We have measured energy spectra of He + scattered from an Al 71 Pd 20 Mn 9 quasicrystal, which was oriented perpendicular to the 5-fold axis, along various azimuthal directions. Strong scattering signals are seen from Al and Pd, but only a weak Mn signal is observed. From measurements made of He + at an oblique angle of incidence scattered in the forward direction, we observe a 72° periodicity in the azimuthal dependence of the scattering signal intensity from Al surface atoms. The effect arises from shadowing effects involving neighboring surface atoms and provides direct evidence that Al surface atoms exist in a local environment with 5-fold symmetry. In addition, measuring the variation of the signal intensity with incidence angle provides information about neighboring atom distances, which compare favorably with a model of the quasicrystal surface derived from the bulk structure. ABSTRACTEnergy-angle distributions of low-energy inert-gas ions scattered from surfaces provide information about surface composition and structure. We have measured energy spectra of He + scattered from an Al 71 Pd 20 Mn 9 quasicrystal, which was oriented perpendicular to the 5-fold axis, along various azimuthal directions. Strong scattering signals are seen from Al and Pd, but only a weak Mn signal is observed. From measurements made of He + at an oblique angle of incidence scattered in the forward direction, we observe a 72• periodicity in the azimuthal dependence of the scattering signal intensity from Al surface atoms. The effect arises from shadowing effects involving neighboring surface atoms and provides direct evidence that Al surface atoms exist in a local environment with 5-fold symmetry. In addition, measuring the variation of the signal intensity with incidence angle provides information about neighboring atom distances, which compare favorably with a model of the quasicrystal surface derived from the bulk structure.

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Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Low-Energy Ion Scattering Measurements from an Al-Pd-Mn Quasicrystal

et al. 2000

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“…Such a surface preparation method leads to a step-terrace surface morphology, with a chemical composition of the near-surface region similar to the bulk. The structural quality of the fivefold surface can be checked down to the atomic scale by STM and compared to bulk structural models, as described elsewhere [17,18]. It is found that the exposed surface planes correspond to Al-rich dense terminations of the quasiperiodic bulk structure, with no chemical segregation or surface reconstruction, except for some interlayer relaxation.…”

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confidence: 99%

Quantum Size Effects in Metal Thin Films Grown on Quasicrystalline Substrates

et al. 2005

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Atomic-scale surface structure determination: comparison of techniques

Hove

1999

Surf. Interface Anal.

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This article reviews and speculates on the relative capabilities of major techniques for detailed structure determination of surfaces and interfaces. These techniques are primarily low‐energy electron diffraction (LEED), x‐ray diffraction (XRD), photoelectron diffraction (PD), x‐ray absorption fine structure (XAFS), ion scattering (IS) and scanning tunneling microscopy (STM). Their use for more qualitative structural characterization is also briefly considered. The limits of their applicability to various types of surfaces and interfaces are explored: solid–gas, solid–liquid and solid–solid interfaces; non‐crystalline surfaces (quasicrystalline, amorphous, liquid); and magnetic structures and imperfect overlayers on crystalline substrates. Copyright © 1999 John Wiley & Sons, Ltd.

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Structural Analysis of the Fivefold Symmetric Surface of the Al70Pd21

Cited by 154 publications

References 13 publications

Low-Energy Ion Scattering Measurements from an Al-Pd-Mn Quasicrystal

Low-Energy Ion Scattering Measurements from an Al-Pd-Mn Quasicrystal

Quantum Size Effects in Metal Thin Films Grown on Quasicrystalline Substrates

Atomic-scale surface structure determination: comparison of techniques

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