论文标题
kagome超导体CSV3SB5薄片中的线性非饱和磁度
Linear nonsaturating magnetoresistance in kagome superconductor CsV3Sb5 thin flakes
论文作者
论文摘要
线性不饱和磁阻（LMR）代表对外部磁场的一类异常电阻率响应，这些响应已在多种材料中观察到，包括但不限于拓扑半米，高-TC超导体和带电荷/自旋密度波（CDW/SDW）顺序的材料。在这里，我们报告了LMR在分层的kagome超导体和CDW材料CSV3SB5薄片中的观察，以及这种LMR的尺寸交叉和温度（T）交叉。具体而言，在超薄的CSV3SB5晶体中，磁阻（MR）表现出从低T处的LMR到CDW过渡温度以上的二次B依赖性的交叉。 MR还表现出从LMR到sublinear MR的交叉，在低t下约20 nm的样品厚度。我们讨论了LMR的几个可能起源，并将效果归因于二维（2D）CDW的波动。我们的结果可能为了解Kagome超导体中竞争订单之间的相互作用提供了新的观点。
Linear nonsaturating magnetoresistance (LMR) represents a class of anomalous resistivity response to external magnetic field that has been observed in a variety of materials including but not limited to topological semi-metals, high-Tc superconductors and materials with charge/spin density wave (CDW/SDW) orders. Here we report the observation of LMR in layered kagome superconductor and CDW material CsV3Sb5 thin flakes, as well as the dimensional crossover and temperature (T) crossover of such LMR. Specifically, in ultrathin CsV3Sb5 crystals, the magnetoresistance (MR) exhibits a crossover from LMR at low T to quadratic B dependence above the CDW transition temperature; the MR also exhibits a crossover from LMR to sublinear MR for sample thickness at around ~20 nm at low T. We discuss several possible origins of the LMR and attribute the effect to two-dimensional (2D) CDW fluctuations. Our results may provide a new perspective for understanding the interactions between competing orders in kagome superconductors.
