Magnetic properties and Fermi-surface topology of kagome magnet HoV₆Sn₆

@misc{beekmann2026magnetic,
  title = {{Magnetic properties and Fermi-surface topology of kagome magnet HoV$_6$Sn$_6$}},
  author = {Tucker Beekmann and Ganesh Pokharel and Wyatt Edward Ackerman and Stephen D. Wilson and David E. Graf and Keshav Shrestha},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.36258},
  eprint = {2609.36258},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.36258},
}

TY  - UNPB
TI  - Magnetic properties and Fermi-surface topology of kagome magnet HoV_6Sn_6
AU  - Tucker Beekmann
AU  - Ganesh Pokharel
AU  - Wyatt Edward Ackerman
AU  - Stephen D. Wilson
AU  - David E. Graf
AU  - Keshav Shrestha
PY  - 2026
DA  - 2026/09/28
PB  - arXiv
DO  - 10.48550/arxiv.2609.36258
UR  - https://arxiv.org/abs/2609.36258
AB  - We report a study of the magnetic properties and Fermi-surface topology of the kagome magnet HoV_6Sn_6 using magnetization and tunnel-diode-oscillator (TDO) measurements. The temperature-dependent magnetization exhibits Curie-Weiss behavior at high temperatures and reveals long-range magnetic order below T_c ≈ 2.4 K. Below Tc, the field-dependent magnetization reveals pronounced magnetic anisotropy, with saturation moments of ≈ 9.5 and 7 μ_B /Ho for fields applied along the out-of-plane and in-plane directions, respectively. To probe the Fermi surface, we perform TDO measurements in magnetic fields up to 41.5 T and at temperatures down to 0.35 K. The TDO signal exhibits well-defined quantum oscillations with multiple frequencies extending up to ∼ 9 kT. Angular- and temperature-dependent measurements are used to determine the Fermi-surface geometry and cyclotron effective masses, respectively. To elucidate the electronic structure, we perform first-principles calculations of the electronic bands, density of states (DOS), and Fermi surface. The calculated band structure exhibits flat-band features, van Hove singularities, and Dirac-like crossings near the Fermi level. The DOS near the Fermi level is dominated by the V-d orbitals, indicating that the V kagome layers play a major role in determining the low-energy electronic properties of HoV6Sn6. Our calculations further support a ferromagnetic ground state with the Ho moments oriented along the c axis, consistent with neutron-scattering measurements. The calculated quantum-oscillation frequencies from the Fermi-surface pockets of HoV6Sn6 are in overall good agreement with the experimentally observed frequencies. Our combined experimental and theoretical results provide insight into the magnetic anisotropy and electronic structure of HoV_6Sn_6 and reveal its multiband Fermi-surface topology.
ER  -