AI 中文总结
本研究确定DyB4为兼具线性色散能带与非共面磁性的磁性外尔半金属，其磁输运兼具四种罕见特性，为多功能磁性拓扑材料提供了新平台。
AI 中文摘要
反常磁输运响应可作为探测轨道运动、动量空间拓扑和实空间手性自旋的互补探针，但因所需条件常相互竞争，将其整合到单一材料中十分罕见。一种有前景的材料设计策略是制备磁性外尔半金属，使其兼具线性色散高迁移率能带、可调非共面磁性，同时限制自旋相关散射。本研究确定了受挫稀土四硼化物DyB4为磁性外尔半金属候选材料，符合该策略且具有交织磁阻与霍尔多功能性。中子衍射显示其存在一系列磁场可调的磁态，包括非共面自旋构型和PT对称性破缺相。第一性原理计算确定了费米能级附近的陡峭线性色散和磁场诱导外尔点。磁输运测量证实其兼具四种罕见特性：极大磁阻、手性反常类负磁阻、由协同本征贝里曲率和偏斜散射产生的大反常霍尔电导率，以及标量自旋手性驱动的拓扑霍尔响应。这种多功能性源于巡游载流子与局域4f磁矩的不同且弱耦合作用，使DyB4成为关联轨道输运、动量空间贝里曲率和实空间自旋手性的4f电子平台，为多功能磁性拓扑材料提供了新途径。
英文摘要
Anomalous magneto-transport responses provide complementary probes of orbital motion, momentum-space topology, and real-space spin chirality, yet their integration into a single material remains rare because their underlying requirements often compete. A promising materials-design strategy is to realize a magnetic Weyl semimetal that combines linearly dispersive high-mobility bands with tunable non-coplanar magnetism while limiting spin-dependent scattering. Here we identify DyB4, a frustrated rare-earth tetraboride, as a magnetic Weyl semimetal candidate that embodies this strategy and hosts intertwined magnetoresistance and Hall multifunctionality. Neutron diffraction reveals a sequence of field-tunable magnetic states, including non-coplanar spin configurations and PT-symmetry-broken phases. First-principles calculations identify steep linear dispersions and field-induced Weyl points near the Fermi level. Magneto-transport measurements establish a rare fourfold combination of extremely large magnetoresistance, chiral-anomaly-like negative magnetoresistance, large anomalous Hall conductivity arising from cooperative intrinsic Berry curvature and skew scattering, and scalar-spin-chirality-driven topological Hall responses. This multifunctionality arises from the distinct yet weakly coupled roles of itinerant carriers and localized 4f moments, which enable high-mobility transport, field-induced Weyl topology, and non-coplanar magnetism. DyB4 therefore provides a 4f-electron platform for correlating orbital transport, momentum-space Berry curvature, and real-space spin chirality, suggesting a route toward multifunctional magnetic topological materials.
Comments28 pages, 6 figures
