The 122 cm-1 Raman mode that appears in FePS3 below its magnetic ordering temperature is an antiferromagnetic magnon with g≈2, not a zone-folded phonon.
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Quasi-Two-Dimensional Magnon Identification in Antiferromagnetic FePS3 via Magneto-Raman Spectroscopy
The 122 cm-1 Raman mode that appears in FePS3 below its magnetic ordering temperature is an antiferromagnetic magnon with g≈2, not a zone-folded phonon.