论文标题
$ {\ tilde s}中的远程磁性顺序= 1/2 $三角形晶格抗Fiferromagnet kces $ _2 $
Long-range magnetic order in the ${\tilde S}=1/2$ triangular lattice antiferromagnet KCeS$_2$
论文作者
论文摘要
最近，在$ {\ tilde s} = 1/2 $稀有的三角形抗fiferromagnets（TLAF）中发现了几种推定的量子自旋液体（QSL）状态。在这些系统中阐明QSL状态的起源的一种方法是确定将它们从推定的QSL状态调整为远程磁性顺序的方法。在这里，我们介绍了基于CE的TLAF KCES $ _2 $，并通过低温特异性热量和$μ$ SR调查显示，它在$ T _ {\ Mathrm n} = 0.38 $ K以下产生的磁性顺序尽管有相同的Delafossite结构。我们从非弹性中子散射和嵌入式群集量子化学计算中确定了一个良好的分离$ {\ tilde s} = 1/2 $的基础状态$ _2 $。单晶上的磁化和电子自旋谐振测量表明，易于平面$ g $〜因子各向异性，与从头算的计算一致。最后，我们的特定热研究揭示了磁场 - 温度相图的平面各向异性，该图可能表明KCES $ _2 $中的各向异性磁相互作用。
Recently, several putative quantum spin liquid (QSL) states were discovered in ${\tilde S} = 1/2$ rare-earth based triangular-lattice antiferromagnets (TLAF) with the delafossite structure. A way to clarify the origin of the QSL state in these systems is to identify ways to tune them from the putative QSL state towards long-range magnetic order. Here, we introduce the Ce-based TLAF KCeS$_2$ and show via low-temperature specific heat and $μ$SR investigations that it yields magnetic order below $T_{\mathrm N} = 0.38$ K despite the same delafossite structure. We identify a well separated ${\tilde S} = 1/2$ ground state for KCeS$_2$ from inelastic neutron scattering and embedded-cluster quantum chemical calculations. Magnetization and electron spin resonance measurements on single crystals indicate a strong easy-plane $g$~factor anisotropy, in agreement with the ab initio calculations. Finally, our specific-heat studies reveal an in-plane anisotropy of the magnetic field-temperature phase diagram which may indicate anisotropic magnetic interactions in KCeS$_2$.
