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Atomic-scale structure of the fivefold surface of an AlPdMn quasicrystal: A quantitative x-ray photoelectron diffraction analysis
Physical Review B (2004)
  • Jin-Cheng Zheng, Department of Physics, National University of Singapore, Lower Kent Ridge Road, Singapore 119260
  • C.H.A. Huan, Department of Physics, National University of Singapore, Lower Kent Ridge Road, Singapore 119260
  • A.T.S. Wee, Department of Physics, National University of Singapore, Lower Kent Ridge Road, Singapore 119260
  • M.A. Van Hove, Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
  • C.S. Fadley, Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
  • F.J. Shi, Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
  • E. Rotenberg, Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
  • S.R. Barman, Inter-University Consortium for DAEF, Indore, India
  • J.J. Paggel, Fachbereich Physik der Freien Universität Berlin, Germany
  • K. Horn, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany
  • Ph. Ebert, Institut für Festkörperforschung des Forschungszentrums Jülich, Germany
  • K. Urban, Institut für Festkörperforschung des Forschungszentrums Jülich, Germany
Abstract
The atomic-scale structure of the fivefold symmetric surface of an AlPdMn quasicrystal is investigated quantitatively by comparing x-ray photoelectron diffraction (XPD) simulations to experiment. The observed fivefold symmetry of the diffraction patterns indicates that the surface is quasicrystalline with no hint of a reconstruction from the bulk structure. In analyzing the experimental data, many possible bulk terminations have been tested. Those few that fit best to the data have in common that they contain an Al-rich surface layer followed by a dense mixed Al/Pd/Mn layer. These best terminations, while not identical to each other, are suggested to form terraces coexisting on a real surface. Structural relaxations of the quasicrystal surface are also analyzed: mixing several best-fit terminations gives average best-fit interlayer spacing changes of Δd12 = -0.057Å, Δd24 = +0.159Å. These results are in good agreement with a prior structure determination by low-energy
electron diffraction on a sample that was prepared in a different manner.
Publication Date
April, 2004
DOI
10.1103/PhysRevB.69.134107
Citation Information
Jin-Cheng Zheng, C.H.A. Huan, A.T.S. Wee, M.A. Van Hove, et al.. "Atomic-scale structure of the fivefold surface of an AlPdMn quasicrystal: A quantitative x-ray photoelectron diffraction analysis" Physical Review B Vol. 69 Iss. 13 (2004) p. 134107-1 - 134107-10 ISSN: 24699969
Available at: http://works.bepress.com/mavanhove/71/