Förster S, Trautmann M, Roy S, Adeagbo W A, Zollner E M, Hammer R, Schumann F O, Meinel K, Nayak S K, Mohseni K, Hergert W, Meyerheim H L, Widdra W
Institute of Physics, Martin-Luther-Universität Halle-Wittenberg, D-06099 Halle, Germany.
Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany.
Phys Rev Lett. 2016 Aug 26;117(9):095501. doi: 10.1103/PhysRevLett.117.095501. Epub 2016 Aug 24.
We report on the first observation of an approximant structure to the recently discovered two-dimensional oxide quasicrystal. Using scanning tunneling microscopy, low-energy electron diffraction, and surface x-ray diffraction in combination with ab initio calculations, the atomic structure and the bonding scheme are determined. The oxide approximant follows a 3^{2}.4.3.4 Archimedean tiling. Ti atoms reside at the corners of each tiling element and are threefold coordinated to oxygen atoms. Ba atoms separate the TiO_{3} clusters, leading to a fundamental edge length of the tiling 6.7 Å.
我们报告了对最近发现的二维氧化物准晶体近似结构的首次观测。结合从头算计算，使用扫描隧道显微镜、低能电子衍射和表面X射线衍射确定了原子结构和键合方案。该氧化物近似体遵循3².4.3.4阿基米德镶嵌。钛原子位于每个镶嵌单元的角上，并与氧原子形成三配位。钡原子分隔TiO₃簇，导致镶嵌的基本边长为6.7埃。
