The surface structure of icosahedral Al68Pd23Mn9 measured by STM and LEED

Schaub, T.; Bürgler, D. E.; Güntherodt, H.‐J.; Suck, J.-B.; Audier, M.

doi:10.1007/bf01540250

Cited by 66 publications

(75 citation statements)

References 38 publications

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“…This we will first assume and then support in this paper. The terraces observed by Schaub et al 2,4 were related to the sequence of the planes of the model M described above, see also Ref.…”

Section: Introductionmentioning

confidence: 77%

“…Since then other quasicrystal samples have been grown to similar dimensions. To date, most surface studies have been performed on the five-fold surface of i-AlPdMn 2,3,4,5,6,7,8,9,10,11,12,13,14 . A consensus has emerged from these studies that this surface, after fairly standard ultra-high-vacuum (UHV) sputtering and annealing procedures, is itself quasicrystalline.…”

Section: Introductionmentioning

confidence: 99%

“…X-ray photoelectron diffraction (XPD) studies are also consistent with a quasicrystalline surface nature 10,11,12 . Large flat terraces may be produced, and scanning tunnelling microscopy (STM) studies have presented similar images of the quasicrystalline surface 2,3,4,5,7,8,9 . Schaub et al 2,3,4,5 produced detailed STM images of the terraces that reveal a dense distribution of dark pentagonal holes of edgelength circa 4.8Å oriented parallel to each other, together with a more random distribution of bright protrusions.…”

Section: Introductionmentioning

confidence: 99%

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Bulk termination of the quasicrystalline fivefold surface ofAl70Pd21Mn

Papadopolos¹,

Kasner²,

et al. 2002

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The structure of the Al70Pd21Mn9 surface has been investigated using high resolution scanning tunnelling microscopy (STM). From two large five-fold terraces on the surface in a short decorated Fibonacci sequence, atomically resolved surface images have been obtained. One of these terraces carries a rare local configuration in a form of a ring. The location of the corresponding sequence of terminations in the bulk model M of icosahedral i -AlPdMn based on the three-dimensional tiling T * (2F ) of an F-phase has been estimated using this ring configuration and the requirement from the LEED work of Gierer et al. that the average atomic density of the terminations is 0.136 atoms per A 2 . A termination contains two atomic plane layers separated by a vertical distance of 0.48Å. The position of the bulk terminations is fixed within the layers of Bergman polytopes in the model M: they are 4.08Å in the direction of the bulk from a surface of the most dense Bergman layers. From the coding windows of the top planes in terminations in M we conclude that a Penrose (P1) tiling is possible on almost all five-fold terraces. The shortest edge of the tiling P1, is either 4.8Å or 7.8Å. The experimentally derived tiling of the surface with the ring configuration has an edge-length of 8.0 ± 0.3Å and hence matches the minimal edge-length expected from the model.

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Section: Introductionmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bulk termination of the quasicrystalline fivefold surface ofAl70Pd21Mn

Papadopolos¹,

Kasner²,

et al. 2002

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“…The LEED pattern for the clean surface has been characterized before by two different groups. 21,22 The diffraction spot indicated on Fig. 2͑c͒ was thus identified as the ͑32002͒ reflection, and its momentum transfer, according to x-ray diffraction studies of the bulk structure, 2 is 2.61 Å −1 .…”

Section: A Stm and Leed Investigation At Low Temperaturementioning

confidence: 99%

Copper adsorption on the fivefoldAl70Pd21Mn9quasicrystal surface

et al. 2005

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Recently we reported the formation of a quasiperiodic Cu thin film on the fivefold icosahedral Al-Pd-Mn quasicrystal using scanning tunneling microscopy, low energy electron diffraction, and Auger electron spectroscopy. Here we provide details pertaining to the growth, stability, and structure of this film. Structural information has been gained by LEED measurements carried out at 85 K. Cu atoms are organized periodically with a nearest-neighbor distance of 2.5±0.1 Å along the aperiodically spaced rows. Above 8 ML spontaneous mass transport resulting in island formation has been observed by STM. These observations point to ascending adatoms being responsible for the formation of 3D features. Finally, flashing the multilayer film to 570 K results in the desorption or diffusion of Cu into the bulk and the formation of five domains of a periodic structure. Disciplines Condensed Matter Physics | Metallurgy CommentsThis article is from Physical Review B 72 (2005) Recently we reported the formation of a quasiperiodic Cu thin film on the fivefold icosahedral Al-Pd-Mn quasicrystal using scanning tunneling microscopy, low energy electron diffraction, and Auger electron spectroscopy. Here we provide details pertaining to the growth, stability, and structure of this film. Structural information has been gained by LEED measurements carried out at 85 K. Cu atoms are organized periodically with a nearest-neighbor distance of 2.5± 0.1 Å along the aperiodically spaced rows. Above 8 ML spontaneous mass transport resulting in island formation has been observed by STM. These observations point to ascending adatoms being responsible for the formation of 3D features. Finally, flashing the multilayer film to 570 K results in the desorption or diffusion of Cu into the bulk and the formation of five domains of a periodic structure.

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“…Thus, our goal in this study was to examine the composition and structure of the topmost layer. 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].…”

Section: Introductionmentioning

confidence: 99%

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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The surface structure of icosahedral Al68Pd23Mn9 measured by STM and LEED

Cited by 66 publications

References 38 publications

Bulk termination of the quasicrystalline fivefold surface ofAl70Pd21Mn

Bulk termination of the quasicrystalline fivefold surface ofAl70Pd21Mn

Copper adsorption on the fivefoldAl70Pd21Mn9quasicrystal surface

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

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