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MM: Metall- und Materialphysik

MM 24: Quasicrystals

MM 24.3: Vortrag

Mittwoch, 29. März 2006, 14:30–14:45, IFW D

Planar binary dipolar colloidal quasicrystals — •Johannes Roth and Ulrich Koschella — Universität Stuttgart, Institut für Theoretische und Angewandte Physik, 70550 Stuttgart

The stability of planar binary decagonal quasicrystals interacting by dipolar potentials has been studied recently [1] with the help of computer simulations. Here we present new results from the search for possible decagonal and dodecagonal ground states. We discovered a path linking the quasicrystal structures with the best crystalline configurations. Although this proves that the quasicrystals cannot be the ground state in general we can argue that the quasicrystal structures have an advantage if the energy of grain boundaries between different phases and structural relaxations are taken into account. The results are confirmed by Monte-Carlo simulations.

[1] F. Scheffler, P. Maass, J. Roth, and H. Stark, European Physical Journal B 42, 85 (2004)