Anisotropic spin model and multiple- states in cubic systems
arXiv:2301.12629 · doi:10.1103/PhysRevB.107.174408
Abstract
Multiple- states manifest themselves in a variety of noncollinear and noncoplanar magnetic structures depending on the magnetic interactions and lattice structures. In particular, cubic-lattice systems can host a plethora of multiple- states, such as magnetic skyrmion and hedgehog lattices. We here classify momentum-dependent anisotropic exchange interactions in the cubic-lattice systems based on the magnetic representation analysis. We construct an effective spin model for centrosymmetric cubic space groups, and , and noncentrosymmetric ones, , , and : The former include the symmetric anisotropic exchange interaction, while the latter additionally include the Dzyaloshinskii-Moriya interaction. We demonstrate that the anisotropic exchange interaction becomes the origin of the multiple- states by applying the anisotropic spin model to the case under . We show several multiple- instabilities in the ground state by performing simulated annealing. Our results will be a reference for not only exploring unknown multiple- states but also understanding the origin of the multiple- states observed in both noncentrosymmetric and centrosymmetric magnets like EuPtSi and SrFeO.
arXiv comment8 pages, 2 figures, 2 tables
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