Jana, DipankarVaclavkova, D.Mohelsky, I.Kapuscinski, P.Cho, C. W.Breslavetz, I.Białek, M.Ansermet, J. PhPiot, B. A.Orlita, M.Faugeras, C.Potemski, M.2025-01-242025-01-242025-01-242024-12-0110.1038/s41598-024-67356-42-s2.0-85200036922https://infoscience.epfl.ch/handle/20.500.14299/24351439080382Magneto-spectroscopy methods have been employed to study the zero-wavevector magnon excitations in MnPSe3. Experiments carried out as a function of temperature and the applied magnetic field show that two low-energy magnon branches of MnPSe3 in its antiferromagnetic phase are gapped. The observation of two low-energy magnon gaps (at 1.70 ± 0.05 meV and 0.09 ± 0.01 meV) implies that MnPSe3 is a biaxial antiferromagnet. A relatively strong out-of-plane anisotropy imposes the spin alignment to be in-plane whereas the spin directionality within the plane is governed by a factor of 2.5 × 10−3 weaker in-plane anisotropy.entruetext::journal::journal article::research article