论文标题
动态缩放作为yb $ _2 $ ti $ _2 $ o $ $ _7 $的多个阶段竞赛的签名
Dynamical scaling as a signature of multiple phase competition in Yb$_2$Ti$_2$O$_7$
论文作者
论文摘要
$ \ rm YB_2TI_2O_7 $是具有高度施工，各向异性交换相互作用的Pyrochlore磁铁的著名示例。迄今为止，人们的注意力主要集中在其不寻常的静态特性上，其中许多特性可以理解为来自不同类型的磁顺序之间的竞争。在这里，我们使用具有异常高能分辨率的非弹性中子散射来探索$ \ rm yb_2ti_2o_7 $的动力学属性。我们发现自旋相关性表现出动态缩放，类似于在量子临界点附近发现的行为。我们表明，可以在多个阶段竞争的现象学理论中解释观察到的缩放崩溃，并确认在$ \ rm yb_2ti_2o_7 $的微观模型的半经典模拟中也可以看到缩放崩溃。这些结果表明，在具有竞争基态的系统中动态的一般图片。
$\rm Yb_2Ti_2O_7$ is a celebrated example of a pyrochlore magnet with highly-frustrated, anisotropic exchange interactions. To date, attention has largely focused on its unusual, static properties, many of which can be understood as coming from the competition between different types of magnetic order. Here we use inelastic neutron scattering with exceptionally high energy resolution to explore the dynamical properties of $\rm Yb_2Ti_2O_7$. We find that spin correlations exhibit dynamical scaling, analogous to behavior found near to a quantum critical point. We show that the observed scaling collapse can be explained within a phenomenological theory of multiple--phase competition, and confirm that a scaling collapse is also seen in semi--classical simulations of a microscopic model of $\rm Yb_2Ti_2O_7$. These results suggest a general picture for dynamics in systems with competing ground states.
