Polar and chiral ${\mathrm{Ni}}_3{\mathrm{TeO}}_6$ was found to exhibit a colossal magnetoelectric (ME) effect associated with collinear antiferromagnetic order. We have investigated the evolution of its magnetic state with the substitution of the ${\mathrm{Ni}}^{2+}$ spins by isotropic ${\mathrm{Mn}}^{2+}$ spins, namely ${(\mathrm{Ni},\mathrm{Mn})}_3{\mathrm{TeO}}_6$ (NMTO). The ground state of NMTO maintains an Ising nature, but a new phase with XY-type magnetic anisotropy is discovered at an intermediate temperature range. Neutron powder diffraction experiments reveal that (1) Mn ions tend to occupy a specific transition-metal site, consistent with the first-principle calculation, and (2) the intermediate phase is an incommensurate (IC) helical magnetic state propagating along the $c$ axis with ${\vec{q}}_{\text{IC}}=(0,0,1.5\pm \delta )$. We also found that the balance between these two magnetic states can be readily manipulated with magnetic fields, which results in significant ME effects. This selective site occupancy of NMTO allows for a unique competition between collinear and helical magnetic structures with minimal chemical disorder. Thus, NMTO serves as a model system to study site-specific chemical control of noncollinear magnetism and ME coupling.

中文翻译：

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由极性和手性 (Ni,Mn)3TeO6 中的磁各向异性调节的螺旋与共线反铁磁顺序

极性和手性 ${你}_3{\mathrm{氧化钛}}_6$被发现表现出与共线反铁磁有序相关的巨大磁电（ME）效应。我们已经研究了其磁态的演变与取代${你}^{2+}$ 各向同性自旋 ${锰}^{2+}$ 旋转，即 ${(你,锰)}_3{\mathrm{氧化钛}}_6$(NMTO)。NMTO 的基态保持 Ising 性质，但在中间温度范围内发现了具有 XY 型磁各向异性的新相。中子粉末衍射实验表明 (1) Mn 离子倾向于占据特定的过渡金属位点，与第一性原理计算一致，(2) 中间相是一个不公度 (IC) 的螺旋磁态，沿着$C$ 轴与 ${\vec{q}}_{\text{我知道了}}=(0,0,1.5\pm \delta )$. 我们还发现这两种磁态之间的平衡可以很容易地用磁场来操纵，这会导致显着的 ME 效应。NMTO 的这种选择性位点占据允许共线和螺旋磁结构之间的独特竞争具有最小的化学紊乱。因此，NMTO 作为一个模型系统来研究非共线磁性和 ME 耦合的站点特定化学控制。