Pulsed magnetic field studies of topological magnetic kagome compounds*

Magnetic Weyl semimetals provide an interesting opportunity to study the interplay between local spin texture, band topology and correlations. The rare earth 166 kagome materials are a prime example, which exhibit complex magnetic orders driven by competing interactions and anisotropies, as well as an electronic structure that embodies both flat band and linear (Dirac) band crossings. Specifically, this includes ErMn₆Sn₆ which crystallizes in a hexagonal space group P6/mmm (No. 191). The recent neutron diffraction data shows that ErMn₆Sn₆ exhibits a first order transition from a planar-ferrimagnetic to distorted triple-spiral magnetic order at T = 92 K and the theoretical calculations using the mean-field theory predict a very rich magnetic phase diagram of ErMn₆Sn₆ [1]. We present the experimental measurements of magnetization in pulsed magnetic field with H//a, H//b and H//c. The rich variety of magnetic phases gives us opportunity to study the behavior of Dirac fermions with control of the spin orientations tuned by the magnetic field. High field magnetoresistivity and Hall effect measurement helped us to identify novel magnetic and topological phases and probe Fermi surface topology via quantum oscillations. This combination of experiments reveals the possibility of tuning topological properties in ErMn₆Sn₆ via the application of strong magnetic fields.

[1] Riberolles, S. X. M, et al. arXiv preprint arXiv:2306.13206 (2023).