We report a detailed study of the physical properties of single crystals of ${\mathrm{DyCoGa}}_5$ using magnetic susceptibility, specific heat, and resistivity measurements. ${\mathrm{DyCoGa}}_5$ crystallizes in the layered tetragonal ${\mathrm{HoCoGa}}_5$-type structure and undergoes two successive antiferromagnetic transitions at $T_{N1}$ = 24.7 K and $T_{N2}=22.9$ K, which are associated with ordering of the ${\mathrm{Dy}}^{3+}$ moments. We characterize the temperature-field phase diagrams of ${\mathrm{DyCoGa}}_5$ for fields both along the $c$ axis and within the $ab$ plane, where highly anisotropic magnetic behaviors are observed. When fields are applied along the easy $c$ axis, both $T_{N1}$ and $T_{N2}$ are suppressed with increasing field, and multiple metamagnetic transitions are observed, while these transitions exhibit only a weak field dependence for $H\parallel ab$. From our analysis we propose a crystalline-electric-field scheme that gives rise to the observed Ising anisotropy, and a simple model of the magnetic exchange interactions can account for the low-temperature antiferromagnetic phase, as well as the field-induced phase with a magnetization half the saturated value.

中文翻译：

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反铁磁DyCoGa5的各向异性磁特性

我们报告了单晶物理性质的详细研究${\mathrm{镝钴镓}}_5$使用磁化率、比热和电阻率测量。${\mathrm{镝钴镓}}_5$结晶为层状四方晶系${\mathrm{霍科嘎}}_5$型结构并经历两次连续的反铁磁转变${\mathrm{时间}}_{氮1}$= 24.7 K 和${\mathrm{时间}}_{氮2}=22.9$ K，与排序相关${镝}^{3+}$时刻。我们表征了温度场相图${\mathrm{镝钴镓}}_5$对于沿线的字段$C$轴和内$A乙$平面，观察到高度各向异性的磁行为。当沿着容易的方向应用字段时$C$轴，两者${\mathrm{时间}}_{氮1}$和${\mathrm{时间}}_{氮2}$随着磁场的增加而受到抑制，并且观察到多个变磁转变，而这些转变仅表现出弱的场依赖性$H\parallel A乙$。根据我们的分析，我们提出了一种晶体电场方案，该方案产生了观察到的伊辛各向异性，并且磁交换相互作用的简单模型可以解释低温反铁磁相以及具有磁化强度为饱和值的一半。