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

TL;DR

This study reveals pseudogap behavior in the kagome material ScV6Sn6 through magnetotransport measurements, showing anomalies above the charge density wave transition that indicate fluctuating CDW effects on electronic properties.

Contribution

It provides the first comprehensive magnetotransport analysis of ScV6Sn6, uncovering pseudogap phenomena and high-temperature CDW fluctuations affecting its normal state.

Findings

Anomalous transport phenomena observed above CDW transition

Decrease in carrier density with decreasing temperature

Violation of Kohler's rule indicating pseudogap formation

Abstract

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$.