AI 中文总结
本文针对非共线反铁磁MnTe块体单晶，系统研究其磁输运特性，揭示磁有序、晶体对称性与SOC的相互作用，检测到二阶非线性霍尔信号，强调需探索不同导电 regime下的磁输运以全面理解非共线反铁磁性质。
AI 中文摘要
六方MnTe是典型的半导体型非共线反铁磁（altermagnet），其性质受本征无序的强烈影响，但由此产生的多样输运 regimes如何塑造其磁输运行为，以及相对论自旋轨道耦合（SOC）的作用，仍有待阐明。本文对MnTe块体单晶的各向异性磁电阻（AMR）、平面霍尔效应（PHE）和非线性输运开展了系统研究。在奈尔温度（TN~304 K）以下，高温金属 regime中AMR和PHE内高阶谐波的出现，揭示了磁有序、晶体对称性与SOC的相互作用；在相对更低温度下，高阶对称性的消失与输运向跳跃传导 regime的转变相吻合，表明载流子局域化降低了输运对费米面拓扑的敏感性。此外，本文检测到明显的二阶非线性霍尔信号，为非共线反铁磁MnTe中存在宏观反演不对称响应提供了证据。将研究扩展至局域 regime，可为理解无序和SOC在宏观电荷输运中的微妙作用提供关键见解，本研究强调了探索不同导电 regime下磁输运以全面理解非共线反铁磁性质的必要性。
英文摘要
Hexagonal MnTe is a prototypical semiconducting altermagnet whose properties are heavily influenced by intrinsic disorder, yet how the resulting diverse transport regimes shape its magnetotransport behavior remains to be clarified alongside the role of relativistic spin-orbit coupling (SOC). Here, we present a systematic study of the anisotropic magnetoresistance (AMR), planar Hall effect (PHE), and nonlinear transport in MnTe bulk single crystals. Below the Néel temperature (TN ~ 304 K), the emergence of high-order harmonics in AMR and PHE within the high-temperature metallic regime reveals the interplay of magnetic order, crystalline symmetry, and SOC. At relatively lower temperatures, the disappearance of higher-order symmetries coincides with a transport crossover into the hopping conduction regime, suggesting that carrier localization diminishes the transport sensitivity to the Fermi-surface topology. In addition, we detect distinct second-order nonlinear Hall signals, providing evidence for a macroscopic inversion-asymmetric response in altermagnetic MnTe. Extending the investigations into the localized regime provides key insights into the subtle role of disorder and SOC in macroscopic charge transport. Our work thus underscores the necessity of exploring magnetotransport across diverse conducting regimes to comprehensively understand altermagnetic properties.
Journal refFrontiers of Physics,2026
DOI：10.15302/frontphys.2027.025204
