Year: 2026
Type: preprint
Abstract: We report a study of the magnetic properties and Fermi-surface topology of the kagome magnet HoV$_6$Sn$_6$ 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 $T_c$ $\approx$ 2.4 K. Below Tc, the field-dependent magnetization reveals pronounced magnetic anisotropy, with saturation moments of $\approx$ 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 $\sim$ 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$_6$Sn$_6$ and reveal its multiband Fermi-surface topology.
Source: arXiv (Cornell University)
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: National Science Foundation, U.S. Department of Energy, University of West Georgia, National High Magnetic Field Laboratory, Office of Science, Oak Ridge Institute for Science and Education, University of California, Santa Barbara, West Texas A and M University, Division of Materials Research, Workforce Development for Teachers and Scientists, Los Alamos National Laboratory, State of Florida
Awards: HSI Pilot Poject: Recruitment, Bridge Course and Undergraduate Research Experience (RBCURE), G1019936685, G2120098773, CC* Compute: GROWTH - Gateway for Increased Research Output at a West Texas Higher-education Campus, G501274426, G5970016230, G5975534213, G6692005437, National High Magnetic Field Laboratory Renewal 2023-2027, G742574937, Enabling Quantum Leap: Q-AMASE-i: Quantum Foundry at UCSB, G8152425740, G8618556185
OpenAlex ID: W7214987686