open access

https://hdl.handle.net/2115/90122

Anisotropic spin model and multiple-Q states in cubic systems

英語

2023

American Physical Society (APS)

Physical Review B

107(17)

174408

Multiple-Q 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-Q states, such as magnetic skyrmion and hedgehog lattices. We here classify momentum-dependent anisotropic exchange interactions in cubic-lattice systems based on magnetic representation analysis. We construct an effective spin model for centrosymmetric cubic space groups, Pm3 over bar m and Pm3 over bar , and noncentrosymmetric ones, P4 over bar 3m, P432, and P23: The former include the symmetric anisotropic exchange interaction, while the latter additionally include the Dzyaloshinskii-Moriya interaction. By performing simulated annealing for the Pm3 over bar model, we demonstrate that the symmetric anisotropic exchange interaction becomes the origin of the multiple-Q states in the ground state. We also analyze the instability toward the multiple-Q states in the presence of the momentum-dependent anisotropic exchange interaction under the Pm3 over bar symmetry in a complementary way. Our results will be a reference for not only exploring unknown multiple-Q states but also understanding the origin of the multiple-Q states observed in both noncentrosymmetric and centrosymmetric cubic magnets like EuPtSi and SrFeO3.

学術雑誌論文

Version of Record

©2023 American Physical Society

2469-9950