Non-relativistic spin splitting in compensated magnets that are not altermagnets
arxiv(2024)
摘要
The non-relativistic spin-splitting (NRSS) of electronic bands in
"altermagnets" has sparked renewed interest in antiferromagnets (AFMs) that
have no net magnetization. However, altermagnets with collinear and compensated
magnetism are not the only type of NRSS AFMs. In this study, we identify the
symmetry conditions and characteristic signatures of a distinct group of NRSS
AFMs that go beyond the description of altermagnets. These compounds exhibit a
broken spin-degeneracy among the spin-polarized bands at the Γ point in
the absence of spin-orbit coupling (SOC). We use density functional theory
calculations to validate these models in ternary magnetic nitrides,
specifically MnXN_2 (X = Si, Ge, Sn), and their cation ordered variants. By
removing the previous NRSS constraint on Γ, these compounds may
facilitate the generation of spin currents without cancellation arising from
the alternating spin polarizations. Our findings expand the scope of NRSS
eligible materials.
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