论文标题
原始量子的临界量
Pristine quantum criticality in a Kondo semimetal
论文作者
论文摘要
在不同相关的电子系统中，观察量子关键的观察在建立有序原理，发现新阶段并确定相关的自由和互动程度方面发挥了作用。到目前为止，重点是绝缘子和金属。在实验中探索的半学作为具有非平凡拓扑的候选阶段的最新兴趣。在这里，我们研究了通过磁敏感性，比热和非弹性中子散射实验的Kondo半学CERU $ _4 $ sn $ _6 $。磁性grünesien比率的幂律差异表明，令人惊讶的是，这种化合物在不进行调整的情况下是量子关键的。中子反应中温度缩放的动力学能量在整个布里渊区都可以看到，以及静态均匀敏感性的温度依赖性表明温度是关键性中唯一的能量尺度。这种行为与金属系统中的昆多破坏量子关键性有关，在半准环境中很可能是通用的。
The observation of quantum criticality in diverse classes of strongly correlated electron systems has been instrumental in establishing ordering principles, discovering new phases, and identifying the relevant degrees of freedom and interactions. At focus so far have been insulators and metals. Semimetals, which are of great current interest as candidate phases with nontrivial topology, are much less explored in experiments. Here we study the Kondo semimetal CeRu$_4$Sn$_6$ by magnetic susceptibility, specific heat, and inelastic neutron scattering experiments. The power-law divergence of the magnetic Grünesien ratio reveals that, surprisingly, this compound is quantum critical without tuning. The dynamical energy over temperature scaling in the neutron response, seen throughout the Brillouin zone, as well as the temperature dependence of the static uniform susceptibility indicate that temperature is the only energy scale in the criticality. Such behavior, which has been associated with Kondo destruction quantum criticality in metallic systems, may well be generic in the semimetal setting.
