MnTe 交替磁体的本征单晶
Intrinsic single crystals of MnTe altermagnet
浏览论文内容
中文总结 AI 辅助
研究 MnTe 单晶，用自熔剂法合成，通过多种测量方法研究其结构与性质，发现晶体在特定温度下有复杂畴动力学及安德森绝缘态，虽与缺 Te 样品不同，但交替磁性标志仍存在且幅度降低。
中文摘要 AI 辅助
我们报告了典型交替磁体 MnTe 的超高质量单晶的合成方法、结构和本征性质。通过自熔剂法获得的晶体几乎没有晶体缺陷和化学组成不均。在准自由站立配置下的测量中，晶体在 310K 的交替磁转变的过热和过冷状态下表现出复杂且各向异性的畴动力学。在约 150K 以下观察到安德森绝缘态，载流子密度约为 1.6×10¹⁷cm⁻³。尽管与缺 Te 样品中的金属态形成鲜明对比，但交替磁性的标志、反常霍尔效应和 X 射线磁圆二色性信号在本征极限下依然存在，不过幅度显著降低。
英文摘要
We report the synthesis methodology, structure, and intrinsic properties of ultra-high quality single crystals of MnTe, an archetypal altermagnet. The crystals, obtained from self-flux method, are nearly free from crystal imperfections and disproportionate chemical compositions as seen by various investigation methods. In measurements under quasi free-standing configuration minimizing stress induced effects, the crystals exhibit complex and anisotropic domain kinetics in both superheating and supercooling regimes around the altermagnetic transition at $T_{\mathrm{N}} = 310\,\mathrm{K}$. An Anderson insulating state is observed below $T_{\mathrm{MI}}\approx 150\,\mathrm{K}$ with a carrier density of about $1.6\times 10^{17}\,\mathrm{cm}^{-3}$, being sharply contrast to metallic states usually seen in Te-deficit samples. Nevertheless, hallmarks of altermagnetism, anomalous Hall effect and X-ray magnetic circular dichroism signal, are robust in this intrinsic limit, however with significantly reduced magnitudes.
