Atomic scale coexistence of periodic and quasiperiodic order in a 2-fold Al-Ni-Co decagonal quasicrystal surface

Park, Jeong Young; Ogletree, D. Frank; Salmerón, Miquel; Ribeiro, R. A.; Canfield, Paul C.; Jenks, Cynthia J.; Thiel, Patricia A.

doi:10.1103/physrevb.72.220201

Cited by 27 publications

(15 citation statements)

References 23 publications

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“…[4]. Even if topographic heights are certainly different for these two recorded STM images, profile shapes and, hence, substrate corrugation length scales (arranged in Fibonacci sequence) look pretty similar.…”

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confidence: 91%

Filippov, Vanossi, and Urbakh Reply:

2011

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Filippov, Vanossi, and Urbakh Reply: We thank McLaughlin, Rabson, and Thiel [1] for their interest in our original work [2] and for their attentive reading.Based on a 2D generalized Prandtl-Tomlinson model, the main conclusion of our Letter [2] is ''that the difference between the length scales of potential corrugation in the periodic and aperiodic directions is the main source of the observed anisotropy of friction on the Al-Ni-Co quasicrystal surface.'' The Prandtl-Tomlinson model demonstrates that the friction force along a given direction is mainly defined by the maximal gradient of the potential in that direction, which is dictated, besides the amplitudes of the substrate potential, by the length scales of potential corrugation. The length scales of potential corrugation depend, in turn, in a correlated way, on both lattice periodicity of the substrate and on the widths of the Gaussian functions used to mimic the potential. We do certainly agree with McLaughlin, Rabson, and Thiel that both these interrelated features are important, and their careful analysis highlights this issue.Notwithstanding the theoretical interest of this ''parametric'' study, we did not play systematically in our work

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confidence: 91%

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2011

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“…This is in line with termination layers in other complex metallic alloys [17][18][19] and quasicrystals. 11,[20][21][22] Moreover, the surface structure of all three terminations could successfully be obtained by only slight modifications to the appropriate bulk layers. The modifications were necessary because the A and B terminations present three different surface reconstructions.…”

Section: Discussionmentioning

confidence: 99%

“…6,10 Therefore a detailed knowledge of the surface structure is essential. In the case of the ͑12100͒ and the ͑10000͒ twofold quasicrystal surfaces, scanning tunneling microscopy ͑STM͒ studies 3,[11][12][13] reveal a strong tendency to develop an anisotropic surface structure. The ͑10000͒ d-Al-Ni-Co surfaces present a columnar structure along the periodic ͓00001͔ direction with a well-defined 0.8-nm periodic reconstruction.…”

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confidence: 99%

Revealing the atomic surface structure of the (100) Y-Al-Ni-Co approximant by low-energy electron diffraction and scanning tunneling microscopy

et al. 2010

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In this paper we present an investigation of the ͑100͒ Y-Al 75.8 Ni 2.1 Co 22.1 surface, which is structurally and chemically related to the ͑10000͒ twofold symmetric surface of the decagonal Al-Ni-Co quasicrystal. The atomic surface structure was probed by low-energy electron diffraction ͑LEED͒ and by scanning tunneling microscopy ͑STM͒, revealing three different surface terminations and three different types of surface reconstructions. All three terminations were successfully assigned to the densest bulk layers and the origin of the surface reconstructions revealed by LEED could be identified locally by STM. The ͑100͒ Y-Al-Ni-Co surface shares with the related ͑10000͒ d-AlNiCo quasicrystal surface the strong tendency of reconstruction, which in the former case is occurring along the b axis and in the later along the periodic ͓00001͔ direction. Gaining a theoretical understanding of the reconstructions of the ͑100͒ Y-Al-Ni-Co surface might therefore help to understand the stability of bulk and surface atomic structures in decagonal quasicrystals. Furthermore, due to the strong relation to the quasicrystalline ͑10000͒ d-AlNiCo surface, the crystalline ͑100͒ Y-Al 75.8 Ni 2.1 Co 22.1 surface is now a very promising candidate to study directional anisotropies in epitaxial thin film growth, friction, or the electronic structure, with the advantage of representing a much simpler structure ͑32 atoms/unit cell͒ which can be theoretically addressed with less effort compared to its quasicrystalline counter part.

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“…To address these questions, we performed a comparative study of the friction properties of Al 72 Ni 11 Co 17 decagonal quasicrystals using the twofold symmetric surface (parallel to the tenfold axis) 13 with both AFM and a pin-on-disk tribometer.…”

Section: Introductionmentioning

confidence: 99%

Friction anisotropy: A unique and intrinsic property of decagonal quasicrystals

et al. 2008

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We show that friction anisotropy is an intrinsic property of the atomic structure of Al-Ni-Co decagonal quasicrystals and not only of clean and well-ordered surfaces that can be prepared in vacuum [ J.Y. Park et al., Science 309, 1354 (2005)]. Friction anisotropy is manifested in both nanometer-size contacts obtained with sharp atomic force microscope tips and macroscopic contacts produced in pin-on-disk tribometers. We show that the friction anisotropy, which is not observed when an amorphous oxide film covers the surface, is recovered when the film is removed due to wear. Equally important is the loss of the friction anisotropy when the quasicrystalline order is destroyed due to cumulative wear. These results reveal the intimate connection between the mechanical properties of these materials and their peculiar atomic structure. KeywordsAmes Laboratory, Quasicrystal, Tribology, Scanning-probe microscopy (SPM) We show that friction anisotropy is an intrinsic property of the atomic structure of Al-Ni-Co decagonal quasicrystals and not only of clean and well-ordered surfaces that can be prepared in vacuum [J.Y. Park et al., Science 309, 1354(2005]. Friction anisotropy is manifested in both nanometer-size contacts obtained with sharp atomic force microscope tips and macroscopic contacts produced in pin-on-disk tribometers. We show that the friction anisotropy, which is not observed when an amorphous oxide film covers the surface, is recovered when the film is removed due to wear. Equally important is the loss of the friction anisotropy when the quasicrystalline order is destroyed due to cumulative wear. These results reveal the intimate connection between the mechanical properties of these materials and their peculiar atomic structure. Disciplines Materials Science and Engineering | Physical Chemistry

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Atomic scale coexistence of periodic and quasiperiodic order in a 2-fold Al-Ni-Co decagonal quasicrystal surface

Cited by 27 publications

References 23 publications

Filippov, Vanossi, and Urbakh Reply:

Filippov, Vanossi, and Urbakh Reply:

Revealing the atomic surface structure of the (100) Y-Al-Ni-Co approximant by low-energy electron diffraction and scanning tunneling microscopy

Friction anisotropy: A unique and intrinsic property of decagonal quasicrystals

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