论文标题
蜂窝的单晶研究XXZ磁铁BACO $ _2 $（PO $ _4 $）$ _ 2 $磁场
Single-crystal study of the honeycomb XXZ magnet BaCo$_2$(PO$_4$)$_2$ in magnetic fields
论文作者
论文摘要
我们提出了一项研究高质量的BACO $ _2 $（PO $ _4 $）$ _ 2 $单晶的研究，这是通过磁化，热容量，热膨胀和磁截图测量值的。热力学特性中的尖锐异常在$ t_n = 3.4 \，$ k显示了这些单晶样品中的远距离抗铁磁序列，在polycrystalline baco $ _2 $（po $ $ _4 $）中不存在。面内和平面磁场的温度依赖性磁敏感性强烈各向异性，并揭示出明显的易于平面各向异性。 Curie-Weiss分析意味着强烈的轨道磁性，正如姐妹化合物Baco $ _2 $（ASO $ _4 $）$ _ 2 $所知，该$ _ 2 $被讨论为潜在的Kitaev Spin-Liquid材料。当在低温下应用平面磁场时，baco $ _2 $（po $ _4 $）$ _ 2 $被驱动到另一个有序阶段$ h_ {c1} \ 0.11 \，$ t，然后在$ h _ {c2}的$ h _ c2} c2 c2} c2 c2} c2 cy y of to c2}的进一步过时的过渡阶段，然后再经过了进一步的现场诱导的过渡baco $ _2 $（ASO $ _4 $）$ _ 2 $。此外，我们的最低温度数据表明，Baco $ _2 $（po $ _4 $）中的现场诱导的过渡$ _ 2 $被热辅助域壁运动主导。
We present a study of high-quality BaCo$_2$(PO$_4$)$_2$ single crystals via magnetization, heat-capacity, thermal-expansion and magnetostriction measurements. Sharp anomalies in the thermodynamic properties at $T_N=3.4\,$K reveal a long-range antiferromagnetic order in these single-crystalline samples, which is absent in polycrystalline BaCo$_2$(PO$_4$)$_2$. The temperature dependent magnetic susceptibilities for in-plane and out-of-plane magnetic fields are strongly anisotropic and reveal a pronounced easy-plane anisotropy. A Curie-Weiss analysis implies strong orbital magnetism, as it is known from the sister compound BaCo$_2$(AsO$_4$)$_2$ that is discussed as a potential Kitaev spin-liquid material. When applying in-plane magnetic fields at low temperature, BaCo$_2$(PO$_4$)$_2$ is driven to another ordered phase at a critical field $H_{C1}\approx 0.11\,$T and then undergoes a further field-induced transition to a highly polarized paramagnetic phase at $H_{C2}\approx 0.3\,$T, which is again similar to the case of BaCo$_2$(AsO$_4$)$_2$. In addition, our lowest-temperature data reveal that the field-induced transitions in BaCo$_2$(PO$_4$)$_2$ become dominated by thermally assisted domain-wall motion.
