Pseudogap behavior in charge density wave kagome material ScV${}_6$Sn${}_6$ revealed by magnetotransport measurements

Over the last few years, significant attention has been devoted to studying the kagome materials AV${}_3$Sb${}_5$ (A = K, Rb, Cs) due to their unconventional superconductivity and charge density wave (CDW) ordering. Recently ScV${}_6$Sn${}_6$ was found to host a CDW below $\approx$90K, and, like AV${}_3$Sb${}_5$, it contains a kagome lattice comprised only of V ions. Here we present a comprehensive magnetotransport study on ScV${}_6$Sn${}_6$. We discovered several anomalous transport phenomena above the CDW ordering temperature, including insulating behavior in interlayer resistivity, a strongly temperature-dependent Hall coefficient, and violation of Kohler’s rule. All these anomalies can be consistently explained by a progressive decrease in carrier densities with decreasing temperature, suggesting the formation of a pseudogap. Our findings suggest that high-temperature CDW fluctuations play a significant role in determining the normal state electronic properties of ScV${}_6$Sn${}_6$.