2026/07/16 by Tucker Beekmann, Caue Kaufmann Ribeiro, Kyryl Shtefiienko +4
#cond-mat.str-el
We report a detailed de Haas-van Alphen (dHvA) study of the recently discovered kagome metal LuNb6Sn6 using torque magnetometry, magnetization, and heat-capacity measurements. Temperature-dependent torque and heat-capacity data reveal a charge density wave (CDW) transition at TCDW = 85 K. The thermal hysteresis observed in both measurements establishes the first-order nature of the transition. Quantum oscillation measurements identify two major dHvA frequencies: Falpha ~ 20 T and Fbeta ~ 200 T, and their angular dependence is consistent with ellipsoidal Fermi surface (FS) pockets. Landau fan diagram analysis reveals evidence for a nontrivial Berry phase associated with the Falpha pocket, indicating possible nontrivial electronic topology in LuNb6Sn6. Analysis of the temperature and magnetic field dependence of the oscillations using the Lifshitz-Kosevich formula yields electronic parameters that indicate anisotropic quantum transport properties. First-principles calculations provide further insight into the electronic structure, revealing Dirac-like band crossings, a flat band, and multiple van Hove singularities near the Fermi level. Our calculations based on the pristine phase cannot fully reproduce the experimentally observed quantum oscillation frequencies, suggesting that CDW-induced FS reconstruction plays a crucial role in the ground-state electronic structure of LuNb6Sn6. These results provide new insight into the FS topology and electronic structure of LuNb6Sn6, enriching our understanding of the electronic properties of kagome materials.