论文标题
对基于CO的蜂窝磁铁BACO2（ASO4）2的静液压效应（ASO4）2
Hydrostatic pressure effect on Co-based honeycomb magnet BaCo2(AsO4)2
论文作者
论文摘要
蜂窝抗抗磁性BACO2（ASO4）2，其中较小的面内磁场（H1 = 0.26 t和H2 = 0.52 = 0.52 t = 1.8 K <tn = 5.4 k）引起了两个磁相过渡，引起了基于3D元件CO2+Kitaev物理学的候选材料，以吸引人们的注意力。在这里，我们报告了BACO2（ASO4）2的过渡温度TN和临界场H1和H2的变化，其静液压高达〜20 kbar，这是根据磁化和特定的热量测量结果确定的。在此压力范围内，观察到磁排序温度的边际增加。同时，临界场被显着更改（高达约25-35％）。具体而言，我们发现H1随静水压力增加，即，抗铁磁态通过静水压力稳定，而H2先前与提出的Kitaev旋转液态相关的H2稳定，随着压力的增加而降低。这些结果对用于描述BACO2（ASO4）2的低温磁性特性的磁模型构成了约束。
The honeycomb antiferromagnet BaCo2(AsO4)2, in which small in-plane magnetic fields (H1 = 0.26 T and H2 = 0.52 T at T = 1.8 K < TN = 5.4 K) induce two magnetic phase transitions, has attracted attention as a possible candidate material for the realization of Kitaev physics based on the 3d element Co2+. Here, we report on the change of the transition temperature TN and the critical fields H1 and H2 of BaCo2(AsO4)2 with hydrostatic pressure up to ~ 20 kbar, as determined from magnetization and specific heat measurements. Within this pressure range, a marginal increase of the magnetic ordering temperature is observed. At the same time, the critical fields are changed significantly (up to ~ 25-35 %). Specifically, we find that H1 is increased with hydrostatic pressure, i.e., the antiferromagnetic state is stabilized with hydrostatic pressure, whereas H2, which was previously associated with a transition into a proposed Kitaev spin liquid state, decreases with increasing pressure. These results put constraints on the magnetic models that are used to describe the low-temperature magnetic properties of BaCo2(AsO4)2.
