Noncentral forces in crystals of charged colloids

被引：53
作者：
Reinke, D. [1 ]
Stark, H.
von Gruenberg, H.-H.
Schofield, Andrew B.
Maret, G.
Gasser, U.
机构：
[1] Univ Konstanz, Dept Phys, D-78457 Constance, Germany
[2] Max Planck Inst Dynam & Selbstorg, D-37073 Gottingen, Germany
[3] Karl Franzens Univ Graz, A-8010 Graz, Austria
[4] Univ Edinburgh, Sch Phys, Edinburgh EH9 3JZ, Midlothian, Scotland
[5] ETH, Neutron Scattering Lab, CH-5232 Villigen, Switzerland
[6] Paul Scherrer Inst, CH-5232 Villigen, Switzerland
来源：
PHYSICAL REVIEW LETTERS | 2007年 / 98卷 / 03期
基金：
英国工程与自然科学研究理事会;
关键词：
D O I：
10.1103/PhysRevLett.98.038301
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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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页数：4
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