平面随机各向异性磁体慢冷指数平衡的实验与模拟
Exponential equilibration by slow cooling in the planar random-anisotropy magnet: experiments and simulations
摘要：
DyAs（0.35）V（0.65）O4中交错磁化平衡的中子测量与平面随机各向异性磁体中自旋动力学的蒙特卡罗模拟进行了比较。模拟结果与观察到的显著弛豫现象一致：当快速冷却到低温时，没有观察到磁有序，但是当以小的步骤冷却时，出现有序的磁矩，发现其在通过和低于转变温度的温度下随时间呈指数平衡。与其他随机系统中自旋的冻结相反，即使在最低温度下，该系统中弛豫的时间尺度也不会显著增加。
英文摘要：
Neutron measurements of the equilibration of the staggered magnetization in DyAs(0.35)V(0.65)O4 are compared with Monte Carlo simulations of spin dynamics in a planar random-anisotropy magnet. The simulation results are in agreement with striking observed relaxation phenomena: when cooled rapidly to a low temperature no magnetic ordering is observed, but when cooled in small steps an ordered magnetic moment appears which is found to equilibrate exponentially with time at temperatures through and below the transition temperature. In contrast to the freezing of spins in other random systems, the time scale of the relaxation in this system does not increase significantly even at the lowest temperatures.
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