Long-range magnetic order in the ${\tilde S}=1/2$ triangular lattice antiferromagnet KCeS$

DOI：

10.21468/scipostphys.9.3.041

发表时间：

2020-05

期刊：

arXiv: Strongly Correlated Electrons

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

G. Bastien;B. Rubrecht;E. Häußler;Ph. Schlender;Z. Zangeneh;S. Avdoshenko;R. Sarkar;A. Alfonsov;S. Luther;Y. Onykiienko;Helen C. Walker;Hannes Kühne;V. Grinenko;Z. Guguchia;Vladislav Kataev;H. Klauss;L. Hozoi;Jeroen van den Brink;D. Inosov;B. Büchner;Anja Wolter-Giraud;T. Doert

近年来，在S = 1/2的稀土三角晶格反铁磁体（TLAF）中发现了几种量子自旋液体（QSL）态。澄清这些系统中QSL状态起源的一种方法是确定将它们从假定的QSL状态调整到长程磁序的方法。在这里，我们介绍了Ce基TLAF KCeS$_2$，并显示通过低温比热和$\mu$SR调查，它产生磁序低于$T_{\mathrmN} = 0.38$ K，尽管相同的铜铁矿结构。我们确定了一个良好的分离${\tilde S} = 1/2$基态KCeS$_2$的非弹性中子散射和嵌入集群量子化学计算。单晶的磁化强度和电子自旋共振测量结果表明，与从头计算结果一致，具有较强的易平面g因子各向异性。最后，我们的比热研究揭示了一个平面内的各向异性的磁场-温度相图，这可能表明各向异性的磁相互作用在KCeS$_2$。

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 $\mu$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$_2$.

Long-range magnetic order in the ${\tilde S}=1/2$ triangular lattice antiferromagnet KCeS$_2$

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