Planar and cluster structure of icosahedral quasicrystals |
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Authors: | B Bolliger M Erbudak D D Vvedensky A R Kortan |
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Institution: | 1. Laboratorium für Festk?rperphysik, Eidgen?ssische Technische Hochschule Zürich, CH-8093, Zürich, Switzerland 3. Bell Laboratories, Lucent Technologies, 07974, Murray Hill, New Jersey, U.S.A.
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Abstract: | Twofold-, threefold-, and fivefold-symmetry elements are observed in the near-surface region of the quasicrystal Al70Pd20Mn10 using a real-space imaging technique based on secondary-electron emission. The observed icosahedral point-group symmetry
implies the presence of atomic clusters within the analyzed region of the solid. The same surface produces perfect low-energy
electron diffraction patterns typical for well-defined crystallographic planes. We present a model which reconciles this dual
structural nature of quasicrystals. Our model is constructed from an icosahedral seed followed by concentric symmetry-preserving
“growth” to form the macroscopic solid.
Presented at the VIII-th Symposium on Surface Physics, Třešt’ Castle, Czech Republic, June 28 – July 2, 1999.
This work was supported in part by the Schweizerischer Nationalfonds. |
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