We grew single crystals of EuCo₂P₂ and EuT₂Ge₂ (T: Co, Rh, Ir, Ni, and Pd) by the Bridgman method and Sn- and In-flux methods, and studied their magnetic properties by measuring the specific heat, magnetic susceptibility, and magnetization with the magnetic field parallel to the tetragonal [100] and [001] directions. The anisotropic magnetization curves of these compounds were found to be explained by the J₀–J₁–J₂ Heisenberg molecular field theory model proposed by Johnston [Phys. Rev. B 96, 104405 (2017)], suggesting that the magnetic ground state is a helical antiferromagnetic structure with the helix axis along the [001] direction. On the basis of the results of the present experiment, the anisotropic magnetic properties of EuRh₂Si₂ are also discussed.

中文翻译：

---

EuCo2P2和EuT2Ge2（T：过渡金属）中的磁化过程：实验和理论的比较

我们通过Bridgman方法，Sn和In- Influx方法生长了EuCo ₂ P ₂和EuT ₂ Ge ₂（T：Co，Rh，Ir，Ni和Pd）单晶，并通过测量比磁导率研究了它们的磁性能。热，磁化率和磁化强度，磁场平行于四边形[100]和[001]方向。发现这些化合物的各向异性磁化曲线可以由Johnston提出的J ₀ – J ₁ – J ₂ Heisenberg分子场理论模型解释。B版96，104405（2017）]，表明磁性基态是螺旋反铁磁结构，其螺旋轴沿[001]方向。基于本实验的结果，还讨论了EuRh ₂ Si ₂的各向异性磁性能。