Chaotic motion of twin boundary in organic single crystals.

研究了(TMTSF)_2PF_6中孪晶界的结构和动力学。从显微镜观察，它们呈平面形状，宽度小于10 nm。没有发现它们的形状发生变化。它们的运动和对湮灭不会在晶体表面留下任何痕迹。孪晶边界在受控外力作用下表现出复杂的运动。虽然在相同的力和晶体的相同区域内重复了相同的测量，但孪晶边界会间歇性地移动，其速度在一次又一次中不同。当用每次运行的平均速度归一化孪晶边界的位置相关速度时，归一化后的曲线彼此吻合。这一结果意味着复杂的运动受制于两个特征因素：一个决定运动的模式，另一个决定平均速度的大小。影响重复运行中运动变化的主要因素是“等待时间”，即边界通过该点后经过的时间长度。随着等待时间的增加，平均速度减小。这一结果意味着，运动包括的老化现象不是在边界上，而是在晶体上。

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.