STM study of the atomic structure of the icosahedral Al-Cu-Fe fivefold surface

Cai, T.; Fournée, V.; Lograsso, Thomas A.; Ross, A. R.; Thiel, Patricia A.

doi:10.1103/physrevb.65.140202

Cited by 37 publications

(37 citation statements)

References 20 publications

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“…The structure of i-Al-Cu-Fe and i-Al-Pd-Mn substrates has already been discussed elsewhere. [13][14][15][16] Here, we only provide a brief summary of the main results useful for the understanding of the data presented in this paper. It is observed that the fivefold surface of both samples prepared by sputtering and annealing cycles leads to a terrace and step morphology with atomically smooth terraces extending over several hundreds of nanometers ͓Figs.…”

Section: Methodsmentioning

confidence: 99%

Growth of Bi thin films on quasicrystal surfaces

et al. 2008

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We present a comprehensive study of Bi thin-film growth on quasicrystal surfaces. The substrates used for the growth are the fivefold surface of icosahedral (i)-Al-Cu-Fe and i-Al-Pd-Mn and the tenfold surface of decagonal (d)-Al-Ni-Co quasicrystals. The growth is investigated at 300 and 525 K substrate temperatures and at different coverage (θ) ranging from submonolayer to ten monolayers. The film is characterized by scanning tunneling microscopy, reflection high-energy electron diffraction, and x-ray photoelectron spectroscopy. At 300 K, the deposited Bi yields a quasicrystalline film for θ≤1. For 1<θ<5, it forms nanocrystallites with (100) surface orientation. The islands have magic heights, which correspond to the stacking of four atomic layers (predominantly). The selection of magic heights is interpreted in terms of quantum size effects arising from the electron confinement within the film thickness. The islands establish rotational epitaxial relationship with the substrate. For higher coverage, the film grows with monatomic height, not with magic heights, and reflects the symmetry of the bulk Bi. When deposition is performed at 525 K, terrace diffusion is more effective, resulting in the aggregation of Bi adatoms developing into a smooth monolayer with quasiperiodic order. At this temperature, multilayers do not adsorb. Disciplines Condensed Matter Physics | Metallurgy CommentsThis article is from Physical Review B 78 (2008) We present a comprehensive study of Bi thin-film growth on quasicrystal surfaces. The substrates used for the growth are the fivefold surface of icosahedral ͑i͒-Al-Cu-Fe and i-Al-Pd-Mn and the tenfold surface of decagonal ͑d͒-Al-Ni-Co quasicrystals. The growth is investigated at 300 and 525 K substrate temperatures and at different coverage ͑ ͒ ranging from submonolayer to ten monolayers. The film is characterized by scanning tunneling microscopy, reflection high-energy electron diffraction, and x-ray photoelectron spectroscopy. At 300 K, the deposited Bi yields a quasicrystalline film for Յ 1. For 1 Ͻ Ͻ 5, it forms nanocrystallites with ͑100͒ surface orientation. The islands have magic heights, which correspond to the stacking of four atomic layers ͑predominantly͒. The selection of magic heights is interpreted in terms of quantum size effects arising from the electron confinement within the film thickness. The islands establish rotational epitaxial relationship with the substrate. For higher coverage, the film grows with monatomic height, not with magic heights, and reflects the symmetry of the bulk Bi. When deposition is performed at 525 K, terrace diffusion is more effective, resulting in the aggregation of Bi adatoms developing into a smooth monolayer with quasiperiodic order. At this temperature, multilayers do not adsorb.

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Section: Methodsmentioning

confidence: 99%

Growth of Bi thin films on quasicrystal surfaces

et al. 2008

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“…The quasicrystalline i-Al-Cu-Fe and i-Al-Pd-Mn phases are isostructural and the structure of the fivefold surface of the i-Al-Cu-Fe has been described in the light of a refined structure model. [22][23][24] It has been found that the surface corresponds to a bulk truncation with no reconstruction or chemical segregation. The surface is formed at dense Al-rich layers separated by large interlayer spacings.…”

Section: Introductionmentioning

confidence: 99%

Aperiodic and modulated Pb thin films on fivefold icosahedral Al-Cu-Fe and Al(111): Tailoring the structure of Pb

et al. 2009

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We report on the growth of Pb thin films deposited either on the Al-rich fivefold surface of the icosahedral AlCu-Fe quasicrystal or on the (111) surface of fcc Al. On the quasicrystalline substrate, the diffusion length of Pb adatoms is short due to heterogeneous nucleation that enforces a quasiperiodic structure in the monolayer. On the Al(111) substrate, the mobility of Pb adatoms is high and the interaction with the substrate is flatter, leading to the formation of a (√31×√31)R8.95° higher-order commensurate structure. This moiré structure propagates up to the highest coverages investigated. Disciplines Condensed Matter Physics | Metallurgy CommentsThis article is from Physical Review B 79 (2009) We report on the growth of Pb thin films deposited either on the Al-rich fivefold surface of the icosahedral Al-Cu-Fe quasicrystal or on the ͑111͒ surface of fcc Al. On the quasicrystalline substrate, the diffusion length of Pb adatoms is short due to heterogeneous nucleation that enforces a quasiperiodic structure in the monolayer. On the Al͑111͒ substrate, the mobility of Pb adatoms is high and the interaction with the substrate is flatter, leading to the formation of a ͑ͱ31ϫ ͱ 31͒R8.95°higher-order commensurate structure. This moiré structure propagates up to the highest coverages investigated.

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“…This array of surface morphologies includes rough surfaces, 4-9 faceted voids, 10 and smooth ͑to within a few tenths of an angstrom͒ terraces. 6,8,9,[11][12][13][14][15][16] The latter type of structure-flat terraces-is the topic of this paper.…”

Section: Introductionmentioning

confidence: 99%

Terrace selection during equilibration at an icosahedral quasicrystal surface

et al. 2005

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We investigate the equilibration of a fivefold surface of the icosahedral Al-Pd-Mn quasicrystal at 900-915 and 925-950 K, using scanning tunneling microscopy. After annealing at the lower temperatures, there is a high density of shallow voids on some terraces but not on others; at 925-950 K, the void-rich terraces are much rarer. The terminations that are consumed by voids exhibit a distinctive local atomic configuration, called a "ring" by previous authors. Apparently, through growth and coalescence of the voids, a different termination becomes exposed on the host terraces, which also leads to a change in step heights at the edges of the terraces. We suggest that the shallow steps associated with the voids, and the ring configuration, signal a surface that is in an intermediate stage of structural equilibration. We investigate the equilibration of a fivefold surface of the icosahedral Al-Pd-Mn quasicrystal at 900-915 and 925-950 K, using scanning tunneling microscopy. After annealing at the lower temperatures, there is a high density of shallow voids on some terraces but not on others; at 925-950 K, the void-rich terraces are much rarer. The terminations that are consumed by voids exhibit a distinctive local atomic configuration, called a "ring" by previous authors. Apparently, through growth and coalescence of the voids, a different termination becomes exposed on the host terraces, which also leads to a change in step heights at the edges of the terraces. We suggest that the shallow steps associated with the voids, and the ring configuration, signal a surface that is in an intermediate stage of structural equilibration.

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STM study of the atomic structure of the icosahedral Al-Cu-Fe fivefold surface

Cited by 37 publications

References 20 publications

Growth of Bi thin films on quasicrystal surfaces

Growth of Bi thin films on quasicrystal surfaces

Aperiodic and modulated Pb thin films on fivefold icosahedral Al-Cu-Fe and Al(111): Tailoring the structure of Pb

Terrace selection during equilibration at an icosahedral quasicrystal surface

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