In annealed kagome antiferromagnet FeGe, a field-induced spin-flop transition produces a nonlinear Hall signal below the canting transition, interpreted as a topological Hall effect.
Quantum oscillations revealing topological band in kagome metal ScV6Sn6
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abstract
Compounds with kagome lattice structure are known to exhibit Dirac cones, flat bands, and van Hove singularities, which host numerous versatile quantum phenomena. Inspired by these intriguing properties, we investigate the temperature and magnetic field dependent electrical transports along with the theoretical calculations of ScV6Sn6, a nonmagnetic charge density wave (CDW) compound. At low temperatures, the compound exhibits Shubnikov-de Haas quantum oscillations, which help to design the Fermi surface (FS) topology. This analysis reveals the existence of several small FSs in the Brillouin zone, combined with a large FS. Among them, the FS possessing Dirac band is a non-trivial and generates a non-zero Berry phase. In addition, the compound also shows the anomalous Hall-like behaviour up to the CDW with the CDW phase, ScV6Sn6 presents a unique material example of the versatile HfFe6Ge6 family and provides various promising opportunities to explore the series further.
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Anisotropic transport properties and topological Hall effect in the annealed kagome antiferromagnet FeGe
In annealed kagome antiferromagnet FeGe, a field-induced spin-flop transition produces a nonlinear Hall signal below the canting transition, interpreted as a topological Hall effect.