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  • Title: High-Angular Momentum Excitations in Collinear Antiferromagnet FePS3.
    Author: Wyzula J, Mohelský I, Václavková D, Kapuscinski P, Veis M, Faugeras C, Potemski M, Zhitomirsky ME, Orlita M.
    Journal: Nano Lett; 2022 Dec 14; 22(23):9741-9747. PubMed ID: 36458929.
    Abstract:
    We report on magneto-optical studies of the quasi-two-dimensional van der Waals antiferromagnet FePS3. Our measurements reveal an excitation that closely resembles the antiferromagnetic resonance mode typical of easy-axis antiferromagnets; nevertheless, it displays an unusual, four-times larger Zeeman splitting in an applied magnetic field. We identify this excitation with an |Sz| = 4 multipolar magnon─a single-ion 4-magnon bound state─that corresponds to a full reversal of a single magnetic moment of the Fe2+ ion. We argue that condensation of multipolar magnons in large-spin materials with a strong magnetic anisotropy can produce new exotic states.
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