Wette Patrick, Klassen Ina, Holland-Moritz Dirk, Palberg Thomas, Roth Stephan V, Herlach Dieter M
Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt, 51170 Köln, Germany.
Phys Rev E Stat Nonlin Soft Matter Phys. 2009 Jan;79(1 Pt 1):010501. doi: 10.1103/PhysRevE.79.010501. Epub 2009 Jan 27.
Charged colloidal particles interact via a hard core Yukawa potential, while isotropic Lennard-Jones-like potentials are frequently used as pair potentials in metals. We present measurements of the structure factor of shear molten monodisperse colloids and molten metals using ultrasmall-angle x-ray scattering and elastic neutron scattering, respectively. In both systems data analysis gives evidence of fivefold-symmetric short-range order becoming more pronounced with increasing deviations from equilibrium. The experiments demonstrate that in both systems topological effects control ordering in the melt state.
带电胶体粒子通过硬核 Yukawa 势相互作用，而在金属中，各向同性的类 Lennard-Jones 势常被用作对势。我们分别使用超小角 X 射线散射和弹性中子散射对剪切熔化的单分散胶体和熔化金属的结构因子进行了测量。在这两个系统中，数据分析均表明，随着与平衡态偏差的增加，五重对称短程有序变得更加明显。实验表明，在这两个系统中，拓扑效应在熔体状态下控制着有序化。
