Computer simulation on vortex dynamics in type II superconductors

利用计算机动力学模拟方法研究了玻璃态涡旋物质。一个真正的连续脱钉过渡观察到在零温度下，这也支配低温蠕变运动。与缩放的概念，我们评估在高精度的临界指数和标度函数，我们观察到一个非阿克里乌斯蠕变运动弱集体钉扎布拉格玻璃（BrG）稳定在平衡，而强钉扎著名的阿克里乌斯定律恢复。在这两种情况下，在低温下，在脱钉和蠕变之间发生急剧的交叉。

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.