  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$.

Strongly Correlated Electrons