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American Physical Society, Physical Review Letters, 3(98)

DOI: 10.1103/physrevlett.98.038301

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Noncentral Forces in Crystals of Charged Colloids

Journal article published in 2007 by Daniel Reinke, Holger Stark, H.-H. von Grünberg, Andrew B. Schofield ORCID, Georg Maret, Urs Gasser
This paper is available in a repository.
This paper is available in a repository.

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Abstract

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.