Berlin 2008 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 21: Quasicrystals

MM 21.3: Vortrag

Dienstag, 26. Februar 2008, 12:15–12:30, H 0111

Observation of Archimedean-Like Tiling Structures on Decagonal Quasicrystalline Structures — •Jules Mikhael, Laurent Helden, and Clemens Bechinger — 2. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany.

Spontaneous formation of quasicrystals is typically only observed in rather complex metal alloys, for instance i-AlPdMn or d-AlNiCo, and strongly depends on the specific chemical composition. One way for forming monoatomic quasicrystalline structures is to use the surface of the quasicrystals as templates for adsorbed monolayers. Here we report a real space investigation of the phase behavior of micron-sized colloidal particles adsorbed onto a quasicrystalline decagonal substrate created by interfering five laser beams. An intermediate remarkably stable phase is found revealing likewise crystalline and quasicrystalline characteristics. It can be described as a Fibonacci sequence of periodic (3.3.3.4.4) Archimedean tiling segments. This result opens a route to identify the primordial parameters for the formation of pseudomorphic monoatomic quasicrystals.