论文标题
经典自旋冰中极慢的非平衡单极动力学
Extremely slow non-equilibrium monopole dynamics in classical spin ice
论文作者
论文摘要
我们在经典的旋转冰$ _2 $ _2 $ _2 $ o $ _7 $中报告了非平衡单极动力学，这是通过高分辨率磁截图检测到的。在从Kagome-Ice到饱和冰相的过渡时发生了显着的晶格变化，在纵向和横向磁截图中可见。低于0.6 K的温度下的磁滞开口表明kagome和饱和状态之间的一阶转变。观察到由磁场变化触发的极慢的晶格松弛。这些晶格 - 释放作用是由非平衡单极形成或歼灭过程产生的。从我们的实验中提取的放松时间与理论预测非常吻合，其衰减常数为$ 10 {^4} $ s在0.3 k。
We report on the non-equilibrium monopole dynamics in the classical spin ice Dy$_2$Ti$_2$O$_7$ detected by means of high-resolution magnetostriction measurements. Significant lattice changes occur at the transition from the kagome-ice to the saturated-ice phase, visible in the longitudinal and transverse magnetostriction. A hysteresis opening at temperatures below 0.6 K suggests a first-order transition between the kagome and saturated state. Extremely slow lattice relaxations, triggered by changes of the magnetic field, were observed. These lattice-relaxation effects result from non-equilibrium monopole formation or annihilation processes. The relaxation times extracted from our experiment are in good agreement with theoretical predictions with decay constants of the order of $10{^4}$ s at 0.3 K.
