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Phys. Rev. B 72, 220201(R) (2005) [4 pages]

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

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Jeong Young Park, D. F. Ogletree, and M. Salmeron*
Materials Sciences Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, USA

R. A. Ribeiro and P. C. Canfield
Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

C. J. Jenks and P. A. Thiel
Ames Laboratory, Department of Chemistry, and Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011, USA

Received 4 November 2005; published 8 December 2005

Decagonal quasicrystals are made of pairs of atomic planes with pentagonal symmetry periodically stacked along a 10-fold axis. We have investigated the atomic structure of the 2-fold surface of a decagonal Al-Ni-Co quasicrystal using scanning tunneling microscopy. The surface consists of terraces separated by steps of heights 1.9, 4.7, 7.8, and 12.6 Å containing rows of atoms parallel to the 10-fold direction with an internal periodicity of 4 Å. The rows are arranged aperiodically, with separations that follow a Fibonacci sequence and inflation symmetry. The results indicate that the surfaces are preferentially Al-terminated and in general agreement with bulk models.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.220201
DOI:
10.1103/PhysRevB.72.220201
PACS:
61.44.Br, 68.35.Bs, 68.37.Ef, 68.55.Nq

*Author to whom correspondence should be addressed. Electronic address: mbsalmeron@lbl.gov

 
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