Observation of a dodecagonal oxide quasicrystal and its complex approximant in the SrTiO 3 -Pt(1 1 1) system.
JOURNAL OF PHYSICS-CONDENSED MATTER(2017)
摘要
We report on the formation of a SrTiO3-derived dodecagonal oxide quasicrystal (OQC) at the interface to Pt(111). This is the second observation of a two-dimensional quasicrystal in the class of oxides. The SrTiO3-derived OQC exhibits strong similarities to the BaTiO3-derived OQC with respect to the local tiling geometry. However, the characteristic length scale of the SrTiO3-derived OQC is 1.8% smaller. Coexisting with the OQC a large scale approximant structure with a monoclinic unit cell is identified. It demonstrates the extraordinary level of complexity that oxide approximant structures can reach.
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关键词
oxide quasicrystal,SrTiO3,STM,LEED
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