Dresden 2026 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 98: Altermagnets

TT 98.1: Vortrag

Freitag, 13. März 2026, 09:30–09:45, CHE/0091

Low-energy magnons in the altermagnet α-MnTe — •Kirill Povarov¹, J. Wosnitza^1,2, Sahana Rößler³, Marcus Schmidt⁴, Alexander Tsirlin³, and Sergei Zvyagin¹ — ¹Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, HZDR, Dresden — ²Institut für Festkörper- und Materialphysik, TU Dresden — ³Felix Bloch Institute for Solid State Physics, University of Leipzig — ⁴Max Planck Institute for Chemical Physics of Solids, Dresden

We report high-field electron spin resonance studies of the altermagnetic material α-MnTe in magnetic fields applied parallel to the triangular Mn²⁺ layers. We observe a single antiferromagnetic resonance (AFMR) mode, displaying isotropic behavior with g≃2.01; very close to the free-electron value. At low temperatures the AFMR mode is remarkably sharp, but exhibits a noticeable broadening upon warming indicating the effect of magnon-magnon interactions. Based on this behavior, we estimate the strength of these interactions.

This work was supported by the DFG through the Würzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter - ct.qmat (EXC 2147, project No. 390858490), as well as by HLD at HZDR, member of the European Magnetic Field Laboratory (EMFL).

Keywords: Altermagnetism; Magnetic Excitations; Antiferromagnetic Resonance