Magnon gap excitations in van der Waals antiferromagnet MnPSe$_3$ Article Swipe

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Magnon Antiferromagnetism Condensed matter physics Physics Anisotropy van der Waals force Plane (geometry) Spin (aerodynamics) Wave vector Spin wave Ferromagnetism Quantum mechanics Geometry Molecule Thermodynamics Mathematics

Dipankar Jana , Diana Václavková , Ivan Mohelský , Piotr Kapuściński , C. W. Cho , Ivan Breslavetz , M. Białek , Jean‐Philippe Ansermet , B. A. Piot , M. Orlita , C. Faugeras , M. Potemski ·

YOU? · · 2023 · Open Access · · DOI: https://doi.org/10.48550/arxiv.2309.06866 · OA: W4386755333

Magneto-spectroscopy methods have been employed to study the zero-wavevector magnon excitations in MnPSe$_3$. Experiments carried out as a function of temperature and the applied magnetic field show that two low-energy magnon branches of MnPSe$_3$ in its antiferromagnetic phase are gapped. The observation of two low-energy magnon gaps (at 14 and 0.7 cm$^{-1}$) implies that MnPSe$_3$ 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 $\times$ 10$^{-3}$ weaker in-plane anisotropy.