Surface reconstruction of Au(001): High-resolution real-space and reciprocal-space inspection

被引:50
作者
Hammer, R. [1 ]
Sander, A. [1 ]
Foerster, S. [1 ]
Kiel, M. [1 ]
Meinel, K. [1 ]
Widdra, W. [1 ,2 ]
机构
[1] Univ Halle Wittenberg, Inst Phys, D-06099 Halle, Germany
[2] Max Planck Inst Mikrostrukturphys, D-06120 Halle, Germany
关键词
THIN AU FILMS; EPITAXIAL-GROWTH; PHASE-TRANSITION; AU(100); MICROSCOPY; GOLD; LEED; DIFFUSION; DIFFRACTION; SIMULATION;
D O I
10.1103/PhysRevB.90.035446
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The hexagonal reconstruction of Au(001) has been a model system for the understanding of complex metal surface reconstructions, and it has been intensively studied over almost five decades. Nevertheless, details of the reconstruction regarding the top layer to substrate matching and alignment are not unambiguously identified due to restricted resolution of previously available analytical tools as well as nonuniform sample quality. We therefore quantitatively reinvestigated the system by applying high-resolution real-space and reciprocal-space inspection using scanning tunneling microscopy and spot profile analysis low-energy electron diffraction in analyzing a high-quality Au(001) sample. We show that the Au(001) reconstruction consists of two rotational domains of a commensurate c(28 x 48) superstructure. It results from a Moire-like buckling of a quasihexagonal top layer which is characterized by lattice vectors having a length of 0.9655a and 0.9581a, respectively, where a is the interatomic distance of Au(001). The former vector runs exactly along [110] or [-110], whereas the latter one deviates by 59.75 degrees from those directions. Ar+ ion bombardment at elevated temperatures induces a rotation of the top layers up to angles of +/- 0.83 degrees. Sample annealing yields a turning back into the initial top layer alignment. Rotation and reorientation proceeds continuously, i.e. all angles between 0 and +/- 0.83 degrees are observed. Using simple hard sphere models, the main characteristics of the reconstruction are explained. This includes even structural details of the reconstruction at step edges for nonrotated and rotated quasihexagonal top layers.
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页数:13
相关论文
共 62 条
  • [1] Amidror I., 2009, PERIODIC LAYERS, VI
  • [2] High-resolution LEED analysis of strained Cu layers on Ru(0001)
    Ammer, C
    Meinel, K
    Wolter, H
    Beckmann, A
    Neddermeyer, H
    [J]. SURFACE SCIENCE, 1997, 375 (2-3) : 302 - 314
  • [3] SCANNING TUNNELING MICROSCOPY OBSERVATIONS ON THE RECONSTRUCTED AU(111) SURFACE - ATOMIC-STRUCTURE, LONG-RANGE SUPERSTRUCTURE, ROTATIONAL DOMAINS, AND SURFACE-DEFECTS
    BARTH, JV
    BRUNE, H
    ERTL, G
    BEHM, RJ
    [J]. PHYSICAL REVIEW B, 1990, 42 (15): : 9307 - 9318
  • [4] ON EPITAXIAL GROWTH OF SINGLE-CRYSTAL METAL FILMS FREE OF IMPURITIES - (ALKALI HALIDE SUBSTRATE PREPARATION - HIGH VACUUM - ELECTRON MICROSCOPY - E)
    BAUER, E
    GREEN, AK
    KUNZ, KM
    [J]. APPLIED PHYSICS LETTERS, 1966, 8 (10) : 248 - &
  • [5] BINNIG GK, 1984, SURF SCI, V144, P321, DOI 10.1016/0039-6028(84)90104-3
  • [6] Bond G.C., 2006, CATALYSIS GOLD, DOI 10.1007/bf03215560
  • [7] MOIRE - FORMATION AND INTERPRETATION
    BRYNGDAHL, O
    [J]. JOURNAL OF THE OPTICAL SOCIETY OF AMERICA, 1974, 64 (10) : 1287 - 1294
  • [8] STM characterization of extended dislocation configurations in Au(001)
    de la Figuera, J
    Gonzalez, MA
    Garcia-Martinez, R
    Rojo, JM
    Hernan, OS
    de Parga, ALV
    Miranda, R
    [J]. PHYSICAL REVIEW B, 1998, 58 (03) : 1169 - 1172
  • [9] SIMULATION OF AU(100) RECONSTRUCTION BY USE OF THE EMBEDDED-ATOM METHOD
    DODSON, BW
    [J]. PHYSICAL REVIEW B, 1987, 35 (02): : 880 - 882
  • [10] UHV MICROSCOPY OF THE RECONSTRUCTED AU(001) SURFACE
    DUNN, DN
    ZHANG, JP
    MARKS, LD
    [J]. SURFACE SCIENCE, 1992, 260 (1-3) : 220 - 228