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Published on: December 3, 2013
Magnon gap excitations in van der Waals antiferromagnet MnPSe3
Dipankar Jana1,2, D Vaclavkova1, I Mohelsky1
1Laboratoire National des Champs Magnétiques Intenses, LNCMI-EMFL, CNRS UPR3228, INSA-T, Univ. Grenoble Alpes, Univ. Toulouse, Univ. Toulouse 3, Grenoble and Toulouse, France.
Abstract:
Magneto-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.
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