论文标题
kagome金属中的电子特性和相变,yb0.5co3ge3
Electronic properties and phase transition in Kagome metal, Yb0.5Co3Ge3
论文作者
论文摘要
kagome晶格是调查电子相关性,拓扑和沮丧磁性相互作用的凝结物理学中重要的基本结构。在AV3SB5(A = K,RB,CS)家族中的Kagome金属的最新工作显示了许多相关驱动的扭曲,包括在低温下的对称性断裂电荷密度波和列型超导性。在这里,我们研究了新的Kagome Metal YB0.5CO3GE3,并在电阻率中找到了与AV3SB5行为高度相似的温度依赖性扭结,并且与Co Kagome晶状体的平面结构变形相称,以及C轴的两倍。发现该空间组从P6/MMM到过渡温度以下的P63/M较低,打破了平面镜面和C6旋转,同时沿C方向获得螺钉轴。在非常低的温度下,观察到各向异性负磁磁性,这可能与各向异性磁性有关。这就提出了有关kagome网中扭曲的类型及其所致的物理特性(包括超导性和磁性)的疑问。
The Kagome lattice is an important fundamental structure in condensed matter physics for investigating the interplay of electron correlation, topology, and frustrated magnetism. Recent work on Kagome metals in the AV3Sb5 (A = K, Rb, Cs) family, has shown a multitude of correlation-driven distortions, including symmetry breaking charge density waves and nematic superconductivity at low temperatures. Here we study the new Kagome metal Yb0.5Co3Ge3 and find a temperature-dependent kink in the resistivity that is highly similar to the AV3Sb5 behavior and is commensurate with an in-plane structural distortion of the Co Kagome lattice along with a doubling of the c-axis. The space group is found to lower from P6/mmm to P63/m below the transition temperature, breaking the in-plane mirror planes and C6 rotation, while gaining a screw axis along the c-direction. At very low temperatures, anisotropic negative magnetoresistance is observed, which may be related to anisotropic magnetism. This raises questions about the types of the distortions in Kagome nets and their resulting physical properties including superconductivity and magnetism.