论文标题
相关化合物YBCDSN的实验和理论研究：大磁力和质量增强的证据
Experimental and theoretical study of the correlated compound YbCdSn: Evidence for large magnetoresistance and mass enhancement
论文作者
论文摘要
拓扑半学的异常特征来自其非平凡带结构。强电子相关性对拓扑状态的影响在很大程度上尚未在实际材料中探索。在这里，我们报告了YBCDSN单晶的磁转移特性。我们通过磁敏感性和特定热量发现了两个基本的电子相关性实验证据。该化合物中的电子相关性导致中间价状态并增强电荷载体的有效质量。该相关状态表现出较大的不饱和磁力，低载体密度，磁场诱导金属 - 触发器样跨界的交叉和低温下电阻率的平稳率。该化合物还显示了在低磁场处的尖尖磁磁性电导率，这表明存在弱抗钙化作用。我们的Yb $^{2+} $状态的频段结构计算预测YBCDSN是拓扑结节线半学。
The unusual features of topological semimetals arise from its nontrivial band structure. The impact of strong electron correlations on the topological states remains largely unexplored in real materials. Here, we report the magnetotransport properties of YbCdSn single crystals. We found two fundamental experimental evidences of electron correlations through magnetic susceptibility and specific heat. The electron correlations in this compound lead to an intermediate valence state and enhance the effective mass of the charge carriers. This correlated state exhibits large nonsaturating magnetoresistance, low carrier density, magnetic field induced metal-semiconductor-like crossover and a plateau in resistivity at low temperatures. This compound also shows a cusp-like magnetoconductivity at low magnetic field which indicates the presence of weak antilocalization effect. Our band structure calculations of Yb$^{2+}$ state predict YbCdSn to be a topological nodal-line semimetal.
