论文标题
从拓扑半学eucd $ _2 $ as $ _2 $和eucd $ _2 $ _2 $ sb $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $ _2 $
Resonant X-ray scattering study of diffuse magnetic scattering from the topological semimetals EuCd$_2$As$_2$ and EuCd$_2$Sb$_2$
论文作者
论文摘要
我们已经调查了候选者半法的磁相关性EUCD $ _2pn_2 $，（$ pn $ = as，sb）在欧盟$^{2+} $ $ $ m_5 $ enge上的共振弹性X射线散射（REXS）。 EUCD $ _2 $的弥散散射的温度和场依赖性作为$ _2 $提供了直接的证据，表明欧盟矩量较慢的铁磁相关性远高于Néel温度。相比之下，在等值EUCD $ _2 $ sb $ _2 $的顺磁性阶段中的弥散散射至少是弱的数量级。 EUCD $ _2 $的顺磁阶段中存在的FM相关性可能会产生短寿命的Weyl节点。
We have investigated the magnetic correlations in the candidate Weyl semimetals EuCd$_2Pn_2$, ($Pn$=As, Sb) by resonant elastic X-ray scattering (REXS) at the Eu$^{2+}$ $M_5$ edge. The temperature and field dependence of the diffuse scattering of EuCd$_2$As$_2$ provide direct evidence that the Eu moments exhibit slow ferromagnetic correlations well above the Néel temperature. By contrast, the diffuse scattering in the paramagnetic phase of isostructural EuCd$_2$Sb$_2$ is at least an order of magnitude weaker. The FM correlations present in the paramagnetic phase of EuCd$_2$As$_2$ could create short-lived Weyl nodes.
