Quantum Oscillations Measurement of the Heavy Electron Mass near the van Hove Singularity in a Kagome Metal
arxiv(2024)
摘要
Kagome metals with the Fermi energy tuned near the van Hove singularities
(vHss) have shown to host exotic phases including unconventional
superconductivity and a chiral flux phase arising from a charge density wave.
However, most quantum oscillations studies of the electronic structure of
kagome metals focus on compounds which electronically or magnetically order,
obscuring the unperturbed vHs. Here we present quantum oscillation measurements
of YV_6Sn_6 which contains a pristine kagome lattice free from long range
order. We discovered quantum oscillations corresponding to a large orbit
(≈70
in vanadium based kagome metals (≈3.3 m_e), consistent with a Fermi
pocket whose Fermi level is near the vHs. Comparing with first principles
calculations suggests that the effective mass of this pocket is highly
sensitive to the position of Fermi level. Our study establishes the enhanced
density of states associated with a vHs in a kagome metal, allowing further
insight into a potential driving mechanism for the unconventional electronic
orderings in this class of materials.
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