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Fluctuation-induced order in two-dimensional colloidal clusters

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Europhysics Letters. 2002, 60(3), pp. 474-480. Available under: doi: 10.1209/epl/i2002-00288-6

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The behaviour of a finite number (N = 29) of paramagnetic colloidal particles in 2D circular hard-wall cavities is investigated. By applying a magnetic field B, the interaction between the particles is varied. We demonstrate that the angular diffusion of the particles which are arranged in shells is highly anisotropic and shows a non-monotonic behaviour as a function of B. When reducing radial particle fluctuations in one shell by a ring-shaped optical tweezer, the relative angular diffusion between adjacent shells increases again. This clearly demonstrates that radial particle fluctuations are responsible for an enhanced registration between adjacent shells.

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ISO 690BUBECK, Ralf, Paul LEIDERER, Clemens BECHINGER, 2002. Fluctuation-induced order in two-dimensional colloidal clusters. In: Europhysics Letters. 2002, 60(3), pp. 474-480. Available under: doi: 10.1209/epl/i2002-00288-6
BibTex
@article{Bubeck2002Fluct-4742,
  year={2002},
  doi={10.1209/epl/i2002-00288-6},
  title={Fluctuation-induced order in two-dimensional colloidal clusters},
  number={3},
  volume={60},
  journal={Europhysics Letters},
  pages={474--480},
  author={Bubeck, Ralf and Leiderer, Paul and Bechinger, Clemens}
}
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