Exploration of exotic transport behavior for quantum materials is of great interest and importance for revealing exotic orders to bring new physics. In this work, we report the observation of unconventional prominent planar Hall effect (PHE) and planar anisotropic magnetoresistivity (PAMR) in strange kagome metal KV₃Sb₅. The PHE and PAMR, which are driven by an in-plane magnetic field and display sharp difference from other Hall effects driven by an out-of-plane magnetic field or magnetization, exhibit exotic higher-order oscillations in sharp contrast to those following empirical rule only allowing two-fold symmetrical oscillations. These higher-order oscillations exhibit strong field and temperature dependence and vanish around charge density wave (CDW) transition. The unique transport properties suggest a significant interplay of the lattice, magnetic and electronic structure in KV₃Sb₅. This interplay can couple the hidden anisotropy and transport electrons leading to the unconventional PHE and PAMR in contrast to other materials.

探索量子材料的奇异输运行为对于揭示奇异秩序以带来新物理学具有重大意义和重要性。在这项工作中，我们报告了在奇怪的 kagome 金属 KV ₃ Sb _{5中观察到非常规的显着平面霍尔效应 (PHE) 和平面各向异性磁阻 (PAMR)}. 由面内磁场驱动的 PHE 和 PAMR 与由面外磁场或磁化驱动的其他霍尔效应有明显差异，表现出奇特的高阶振荡，与遵循经验规则的振荡形成鲜明对比只允许二次对称振荡。这些高阶振荡表现出强烈的场和温度依赖性，并在电荷密度波 (CDW) 跃迁周围消失。独特的传输特性表明 KV ₃ Sb ₅中的晶格、磁性和电子结构之间存在显着的相互作用。与其他材料相比，这种相互作用可以耦合隐藏的各向异性和传输电子，从而导致非常规的 PHE 和 PAMR。