Compensated ferrimagnets with exchange-coupling asymmetry produce robust spin Seebeck currents comparable to ferromagnets via isotropic magnon splitting, while the effect vanishes in altermagnets.
Journal of Physics: Condensed Matter , abstract =
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Trilayer La4Ni3O10 shows spin excitations with comparable 60 meV bandwidth but substantially suppressed spectral weight relative to bilayer nickelates, indicating weaker electronic correlations and more three-dimensional multi-orbital character.
A mixed singlet-triplet Schwinger boson mean-field theory identifies a chiral bosonic quantum spin liquid in the integer-spin Heisenberg-Kitaev model whose spectrum matches exact diagonalization results up to S~2.
Uniaxial pressure applied to α-SrCr₂O₄ shifts two-magnon Raman excitations in a manner consistent with decreased or increased magnetic anisotropy under tension or compression.
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Collective spin excitations in trilayer nickelate La$_4$Ni$_3$O$_{10}$
Trilayer La4Ni3O10 shows spin excitations with comparable 60 meV bandwidth but substantially suppressed spectral weight relative to bilayer nickelates, indicating weaker electronic correlations and more three-dimensional multi-orbital character.