论文标题
在拓扑绝缘子CABI2单晶中极大的磁倍率的可能起源
Possible origin of extremely large magnetoresistance in the topological insulator CaBi2 single crystal
论文作者
论文摘要
在实验中发现CABI2是一个超导体，过渡温度为2 K，并通过自旋和角度分辨光发射光谱法鉴定为拓扑绝缘体，这使其成为研究超导性和拓扑结构之间相互作用的可能平台。但是，在实验中，CABI2单晶的详细传输特性仍未探索。在这里，我们系统地研究了通过通量方法生长的CABI2单晶的磁通特性。 CABI2显示出磁场引起的上流行为，在低温下电阻率具有平稳性。在3 K和12 t时，极其大且非饱和磁磁性高达约15000％。通过采用Kohler的缩放定律，讨论了在低温下电阻率和极大的磁化率的磁场和温度依赖性的可能原因，这可以通过通过Hall效应测量确认的补偿效应来理解。
CaBi2 has been experimentally found to be a superconductor with a transition temperature of 2 K and identified as a topological insulator via spin- and angle-resolved photoemission spectroscopy, which makes it a possible platform to study the interplay between superconductivity and topology. But the detailed transport properties for CaBi2 single crystal remain unexplored in experiments. Here, we systematically studied the magneto-transport properties of CaBi2 single crystal grown by a flux method. CaBi2 shows a magnetic-field-induced upturn behavior with a plateau in resistivity at low temperature. An extremely large and non-saturating magnetoresistance up to ~15000% at 3 K and 12 T was achieved. The possible reason for the magnetic field and temperature dependence of resistivity and extremely large magnetoresistance at low temperature was discussed by adopting the Kohler's scaling law, which can be understood by the compensation effect confirmed by the Hall Effect measurement.
