重力下相干生长硬球晶体中重力弹性场与部分位错的相互作用：缺陷消失的驱动力
Interplay between elastic fields due to gravity and a partial dislocation for a hard-sphere crystal coherently grown under gravity: driving force for defect disappearance
摘要：
我们先前观察到，通过蒙特卡罗模拟，在重力下相干生长的硬球晶体中，内在的桩错通过肖克利部分位错的滑动收缩<001>[Mori等人，Molec. 105，1377（2007）];这是对十年来长期存在的问题的回答，为什么胶体晶体中的堆积无序在重力下减少[Zhu等人，Nature 387，883（1997）]。在这里，我们提出了一个弹性能量计算;除了部分位错的自能[Mori等人，Prog. Theor. 178，33（2009）]，我们计算了由于重力引起的弹性场和由于肖克利部分位错引起的弹性场之间的交叉耦合项。交叉项是线性尺寸R的递增函数，在该线性尺寸R上弹性场扩展，示出了部分位错向晶粒的上边界移动的驱动力。
英文摘要：
We previously observed that an intrinsic staking fault shrunk through a glide of a Shockley partial dislocation terminating its lower end in a hard-sphere crystal under gravity coherently grown in <001> by Monte Carlo simulations [Mori et al., Molec. Phys. 105, 1377 (2007)]; it was an answer to a one-decade long standing question why the stacking disorder in colloidal crystals reduced under gravity [Zhu et al., Nature 387, 883 (1997)]. Here, we present an elastic energy calculation; in addition to the self-energy of the partial dislocation [Mori et al., Prog. Theor. Phys. Suppl. 178, 33 (2009)] we calculate the cross-coupling term between elastic field due to gravity and that due to a Shockley partial dislocation. The cross term is a increasing function of the linear dimension R over which the elastic field expands, showing that a driving force arises for the partial dislocation moving toward the upper boundary of a grain.
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