CaMn$_2$P$_2$中的受挫磁性摆线结构与涌现的Potts向列性
Frustrated Magnetic Cycloidal Structure and Emergent Potts Nematicity in CaMn$_2$P$_2$
AI总结：
通过中子衍射确定CaMn$_2$P$_2$的基态为$6\times6$摆线磁结构，关联受挫$J_1$-$J_2$-$J_3$海森堡模型与Potts向列性。
摘要：
我们报道了含有波纹状Mn蜂窝层的单晶CaMn$_2$P$_2$的中子衍射结果，并确定了其基态磁结构。衍射图谱由显著的(1/6, 1/6, $L$)倒格子单位（r.l.u.；$L$为整数）磁布拉格反射组成，其温度依赖强度与在奈尔温度$T_{\rm N} = 70(1)$ K处的一级反铁磁相变一致。我们对衍射图谱的分析揭示了一个面内$6\times6$磁晶胞，其中有序自旋在主轴上每个形成蜂窝结构的子格中最近邻之间以60度步长旋转，与$P_Ac$磁空间群一致。我们发现顺磁$P\bar{3}m11^\prime$晶体对称性的其他几个磁子群对称性（$P_A2/c$, $P_C2/m$, $P_S\bar{1}, P_C2, P_Cm, P_S1$）也与观测到的衍射图谱一致。我们将我们的发现与具有单离子各向异性的受挫$J_1$-$J_2$-$J_3$海森堡蜂窝反铁磁体以及Potts向列性的涌现联系起来。
英文摘要：
We report neutron-diffraction results on single-crystal CaMn$_2$P$_2$ containing corrugated Mn honeycomb layers and determine its ground-state magnetic structure. The diffraction patterns consist of prominent (1/6, 1/6, $L$) reciprocal lattice unit (r.l.u.; $L$ = integer) magnetic Bragg reflections, whose temperature-dependent intensities are consistent with a first-order antiferromagnetic phase transition at the Néel temperature $T_{\rm N} = 70(1)$ K. Our analysis of the diffraction patterns reveals an in-plane $6\times6$ magnetic unit cell with ordered spins that in the principal-axis directions rotate by 60-degree steps between nearest neighbors on each sublattice that forms the honeycomb structure, consistent with the $P_Ac$ magnetic space group. We find that a few other magnetic subgroup symmetries ($P_A2/c$, $P_C2/m$, $P_S\bar{1}, P_C2, P_Cm, P_S1$) of the paramagnetic $P\bar{3}m11^\prime$ crystal symmetry are consistent with the observed diffraction pattern. We relate our findings to frustrated $J_1$-$J_2$-$J_3$ Heisenberg honeycomb antiferromagnets with single-ion anisotropy and the emergence of Potts nematicity
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