Chaotic motion of twin boundary in organic single crystals.

本文研究了（TMTSF）_2PF_6中孪晶界的结构和动力学。从显微镜观察，它们是平面形状，其宽度小于10 nm。它们的形状没有变化，它们的运动和对湮灭在晶体表面没有留下任何痕迹。孪晶界面在受控外力作用下表现出复杂的运动。孪晶界面间歇性地移动，其速度从运行到运行变化，尽管在相同的力下和在晶体的相同区域内重复相同的测量。当孪晶边界的位置相关速度用每次运行的平均速度归一化时，归一化曲线彼此重合。这一结果意味着复杂运动受两个特征因素的影响：一个决定运动的模式，另一个决定平均速度的大小。发现影响多次运行间运动变化的主要因素是边界通过该点后所经过的时间的“等待时间”。随着等待时间的增加，平均速度减小。这一结果意味着运动包括不在边界上而是在晶体上的老化现象。

Structure and dynamics of twin boundaries in (TMTSF) _2PF_6 were studied. From microscopic observations, they are planar in shape and their width is less than 10 nm. No change in their shape was found. Their movement and pair annihilation do not leave any trace in the crystal surface. The twin boundary shows complex motion under controlled external force. The twin boundary moves intermittently and its velocity varies from run to run though same measurement was repeated under the same force and within the same area of the crystal. When position dependent velocity of the twin boundary is normalized by the average velocity in each run, the normalized curves coinside each other. This result means that the complex motion is subject to two characteristic factors ; one determines the pattern of motion and the other does the magnitude of average velocity. The main factor on variety of motions among repeated runs is found "waiting time" how long the time passes after the boundary went through the point. As the waiting time increases, the average velocity decreases. This result means that the motion includes an aging phenomena not on the boundary but on the crystal.