Faculté des sciences

Formation of a Stable Decagonal Quasicrystalline Al-Pd-Mn Surface Layer

Naumovic, D. ; Aebi, Philipp ; Schlapbach, Louis ; Beeli, C. ; Kunze, K. ; Lograsso, T. A. ; Delaney, D. W.

In: Physical Review Letters, 2001, vol. 87, no. 195506, p. 1-4

We report the in situ formation of an ordered equilibrium decagonal Al-Pd-Mn quasicrystal overlayer on the fivefold symmetric surface of an icosahedral Al-Pd-Mn monograin. The decagonal structure of the epilayer is evidenced by x-ray photoelectron diffraction, low-energy electron diffraction, and electron backscatter diffraction. This overlayer is also characterized by a reduced density of... Plus

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    Summary
    We report the in situ formation of an ordered equilibrium decagonal Al-Pd-Mn quasicrystal overlayer on the fivefold symmetric surface of an icosahedral Al-Pd-Mn monograin. The decagonal structure of the epilayer is evidenced by x-ray photoelectron diffraction, low-energy electron diffraction, and electron backscatter diffraction. This overlayer is also characterized by a reduced density of states near the Fermi edge as expected for quasicrystals. This is the first time that a millimeter-size surface of the stable decagonal Al-Pd-Mn is obtained, studied, and compared to its icosahedral counterpart.