Computer simulation on vortex dynamics in type II superconductors

利用动态计算机模拟研究了玻璃态的涡旋物质。在零温度下观察到真正的连续脱屑转变，这也决定了低温蠕变运动。利用标度的概念，我们用高精度的临界指数和标度函数来求值；我们观察到弱集体钉扎作用下的非阿伦尼乌斯蠕变运动，其中布拉格玻璃（BrG）稳定在平衡状态，而强钉扎作用下则恢复了众所周知的阿伦尼乌斯定律。在这两种情况下，在低温下脱屑和蠕变之间发生了急剧的交叉。

Using dynamical computer simulation we have investigated vortex matters in glass states. A genuine continuous depinning transition is observed at zero temperature, which also governs the low-temperature creep motion. With the notion of scaling, we evaluate in high accuracy critical exponents and scaling functions; we observe a non-Arrhenius creep motion for weak collective pinning where Bragg glass (BrG) is stabilized at equilibrium, while for strong pinning the well-known Arrhenius law is recovered. In both cases, a sharp crossover takes place between depinning and creep at low temperatures.