Colour symmetry and altermagnetic-like spin textures in noncollinear antiferromagnets

2025/01/06 by Radaelli, Paolo G., Gurung, Gautam
#FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el)

paper · doi:10.48550/arxiv.2501.02947

Abstract

We present a formalism based on colour symmetry to analyse the momentum-space spin textures of non-collinear antiferromagnets. We show that, out of the spin textures allowed by the magnetic point group, \textcolor\altcolor one can extract a component that is invariant by general rotations in spin space, and can exist in the absence of spin-orbit coupling, in complete analogy to spin textures in altermagnets. We demonstrate this approach in the case of three complex, non-collinear magnets, Mn₃Ir(Ge,Si), Pb₂MnO₄ and Mn₃GaN. For Mn₃GaN, we also show that the predictions of colour-symmetry analysis are consistent with density functional theory calculations performed on the same system both with and without spin-orbit coupling.

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