氘代近藤晶格CeNiSnD$_x$的非弹性中子散射与μ子自旋弛豫研究
Inelastic neutron scattering and muon spin relaxation investigations of the deuterated Kondo lattices CeNiSnD$ _x $
AI总结：
本研究通过μ子自旋弛豫和非弹性中子散射，发现氘化CeNiSnD$_x$中氢化导致Ce-4$f$电子局域化并产生长程磁有序，提出了解释磁性质的CEF能级方案。
摘要：
CeNiSn是一种近藤半金属，由于4$f$电子与传导电子之间的杂化，在低温下会打开一个能隙，但并未形成完整的绝缘态。插入氢后，会诱导出长程磁有序。本文报道了对氘化物CeNiSnD$_x$（$x$=1.0, 1.8）多晶样品的零场μ子自旋弛豫和非弹性中子散射测量。μ子自旋弛豫结果证实，CeNiSnD在约4.7 K以下整个样品中发生磁有序，而非弹性中子散射揭示了CeNiSnD中约13 meV和34 meV处有两个明确的晶场（CEF）激发，CeNiSnD$_{1.8}$则在5 meV和27 meV处。这些结果表明，氢化导致Ce-4$f$电子局域化，从而产生长程磁有序。我们为两种体系提出了CEF能级方案，该方案预测CeNiSnD$_{1.8}$在$ab$面内的基态磁矩为0.96$μ_{\ m B}$/Ce，CeNiSnD沿易磁化$c$轴的饱和磁矩为1.26$μ_{\ m B}$/Ce，这解释了所观察到的磁性质。
英文摘要：
CeNiSn is a Kondo semimetal where a gap opens at low temperatures due to hybridization between 4$f$ and conduction electrons, but a full insulating state fails to develop. Upon the insertion of hydrogen, long range magnetic order is induced. Here we report zero-field muon-spin relaxation and inelastic neutron scattering measurements of polycrystalline samples of the deuterides CeNiSnD$_x$ ($x$=1.0, 1.8). The muon-spin relaxation results confirm magnetic ordering in the whole sample of CeNiSnD below around 4.7 K, while inelastic neutron scattering reveals two well-defined crystalline-electric field (CEF) excitations at around 13 meV and 34 meV in CeNiSnD, and 5 meV and 27 meV for CeNiSnD$_{1.8}$. These results suggest that hydrogenation leads to the localization of the Ce-4$f$ electrons, giving rise to long-range magnetic order. We propose CEF level schemes for both systems, which predict a ground state moment of 0.96$μ_{\rm B}$/Ce within the $ab$-plane for CeNiSnD$_{1.8}$ and a saturated moment of 1.26$μ_{\rm B}$/Ce along the easy $c$ axis for CeNiSnD, that account for the observed magnetic properties.
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