标题： MnTe反铁磁候选材料中相对论到非相对论的净磁化交叉现象 显示英文标题

标题： Crossover from relativistic to non-relativistic net magnetization for MnTe altermagnet candidate

摘要： 我们实验研究了MnTe单晶的磁化翻转曲线，这是反铁磁候选材料。在85~K以上的温度，我们确认了磁化率$M$的反铁磁行为，这已知于$\alpha$--MnTe。在85~K以下，我们观察到异常的低场磁化行为，这种行为伴随着复杂的$M(\alpha)$角度依赖性，具有由$M(\alpha)$最大值和最小值相互作用产生的拍频模式：在低磁场下，$M(\alpha)$表现出类似铁磁性的180$^\circ$周期性，而在高磁场下，周期性变为90$^\circ$。这种角度依赖性是我们实验中最显著的结果，而标准磁性系统无法预期这种现象。相反，在反磁体中，对称性仅允许由于自旋-轨道耦合导致的铁磁行为。因此，我们认为我们的实验显示了MnTe中弱自旋-轨道耦合的效果，从相对论性到非相对论性的净磁化交叉，并因此实验上证实了MnTe中的反磁性。 显示英文摘要

摘要： We experimentally study magnetization reversal curves for MnTe single crystals, which is the altermagnetic candidate. Above 85~K temperature, we confirm the antiferromagnetic behavior of magnetization $M$, which is known for $\alpha$--MnTe. Below 85~K, we observe anomalous low-field magnetization behavior, which is accompanied by the sophisticated $M(\alpha)$ angle dependence with beating pattern as the interplay between $M(\alpha)$ maxima and minima: in low fields, $M(\alpha)$ shows ferromagnetic-like 180$^\circ$ periodicity, while at high magnetic fields, the periodicity is changed to the 90$^\circ$ one. This angle dependence is the most striking result of our experiment, while it can not be expected for standard magnetic systems. In contrast, in altermagnets, symmetry allows ferromagnetic behavior only due to the spin-orbit coupling. Thus, we claim that our experiment shows the effect of weak spin-orbit coupling in MnTe, with crossover from relativistic to non-relativistic net magnetization, and, therefore, we experimentally confirm altermagnetism in MnTe.