Universal sublinear resistivity in vanadium kagome materials hosting charge density waves

Abstract The recent discovery of a charge density (CDW) state in ScV 6 Sn 6 at T CDW = 91 K offers new opportunities to understand the origins of electronic instabilities in topological kagome systems. By comparing to the isostructural non-CDW compound LuV6Sn6, we unravel interesting electrical transport properties in ScV 6 Sn 6 , above and below the charge ordering temperature. We observed that by applying a magnetic field along the a axis, the temperature behavior of the longitudinal resistivity in ScV 6 Sn 6 changes from metal-like to insulator-like above the CDW transition. We show that in the charge ordered state ScV 6 Sn 6 follows the Fermi liquid behavior while above that, it transforms into a non-Fermi liquid phase in which the resistivity varies sublinearly over a broad temperature range. The sublinear resistivity, which scales by T 3/5 is a common feature among other vanadium-containing kagome compounds exhibiting CDW states such as KV3Sb5, RbV3Sb5, and CsV 3 Sb 5 . By contrast, the non-Fermi liquid behavior does not occur in LuV 6 Sn 6 . We explain the T 3/5 universal scaling behavior from the Coulomb scattering between Dirac electrons and Van Hove singularities; common features in the electronic structure of kagome materials. Finally, we show anomalous Hall-like behavior in ScV6Sn6 below TCDW, which is absent in the Lu compound. Comparing the transport properties of ScV 6 Sn 6 and LuV 6 Sn 6 is valuable to highlight the impacts of the unusual CDW in the Sc compound.