Pseudogap behavior in charge density wave kagome material ScV6Sn6 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 theirunconventional superconductivity and charge density wave (CDW) ordering. Recently ScV6Sn6was found to host a CDWbelow approximate to 90 K, and, like AV3(S)b(5), it contains a kagome lattice comprised only of V ions. Here we present a comprehensive magneto transport study on ScV6Sn6. We discovered several anomalous transport phenomena above the CDW ordering temperature, including insulating behavior in interlayer resistivity, a strongly temperature-dependent Hall coefficient, and a violation of Kohler's rule. All these anomalies can be consistently explained by a progressive decrease in carrier densities withdecreasing temperature, suggesting the formation of a pseudogap. Our findings suggest that high-temperature CDWfluctuationsplay a significant role in determining the normal state electronic properties of ScV6Sn6

Automated summary

This study presents a comprehensive magneto transport study on ScV6Sn6, revealing several anomalous transport phenomena above the CDW ordering temperature. These anomalies can be consistently explained by a progressive decrease in carrier densities with decreasing temperature, suggesting the formation of a pseudogap. The findings suggest the significance of high-temperature CDW fluctuations in determining the normal state electronic properties of ScV6Sn6.