Pseudo-Goldstone mode in altermagnetic $\alpha$-MnTe: high-field electron spin resonance studies

K. Yu. Povarov, J. Wosnitza, S. Rößler +3

We report multi-frequency electron spin resonance spectroscopy studies of $\alpha$-MnTe in magnetic fields up to $16$ T, applied along the easy anisotropy axis. At temperatures below $T…