Yb $_2$ Ti $_2$ O $_7$中多相竞争的动力学标度
Dynamical scaling as a signature of multiple phase competition in Yb$_2$Ti$_2$O$_7$
摘要：
$\rm Yb_2Ti_2O_7$是烧绿石磁体的一个著名例子，具有高度受抑的各向异性交换相互作用。迄今为止，人们的注意力主要集中在它不寻常的静态特性上，其中许多可以理解为来自不同类型的磁序之间的竞争。在这里，我们使用非弹性中子散射具有非常高的能量分辨率，探讨$\rm Yb_2Ti_2O_7$的动力学性质。我们发现，自旋相关性表现出动力学标度，类似于量子临界点附近的行为。我们发现，所观察到的标度崩溃可以解释内的多相竞争的唯象理论，并确认，标度崩溃也被视为在半经典模拟的微观模型$\rm Yb_2Ti_2O_7$。这些结果表明，在竞争的基态系统的动力学的一般图片。
英文摘要：
$\rm Yb_2Ti_2O_7$ 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.
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