Two-magnon absorption in a four-sublattice quasi-two-dimensional relativistically noncollinear antiferromagnet
A. L. AlistratovPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, Donetsk; Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovV. N. KrivoruchkoPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, Donetsk; Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovA. A. StepanovPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, Donetsk; Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovD. A. YablonskiĭPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, Donetsk; Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov
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A quasi-two-dimensional four-sublattice antiferromagnet (AFM) with a relativistically noncollinear structure is considered. Photon-decay channels for two-magnon absorption of a microwave field with different polarizations are classified from the point of view of symmetry. It is shown that new channels of intensive two-magnon absorption, which are absent in a collinear multisublattice or a noncollinear two-sublattice system, appear in such a system. It is also shown that the two-magnon absorption in multisublattice magnets may exhibit van Hove singularities even when the single-particle spectrum is free of them.
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