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Noncentral forces in crystals of charged colloids

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Original languageEnglish
Article number038301
Pages (from-to)-
Number of pages4
JournalPhysical Review Letters
Issue number3
Publication statusPublished - 19 Jan 2007


The elastic properties of fcc crystals consisting of charge stabilized colloidal particles are determined from real space imaging experiments using confocal microscopy. The normal modes and the force constants of the crystal are obtained from the fluctuations of the particles around their lattice sites using the equipartition theorem. We show that the Cauchy relation is not fulfilled and that only noncentral many-body forces can account for the elastic properties.

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