Effects of crystal field and momentum-based frustrated exchange interactions on multiorbital square skyrmion lattice
Published in arXiv, 2025
Abstract: Motivated by recent theoretical predictions of a square-shaped skyrmion lattice (S-SkL) in centrosymmetric tetragonal Ce-based magnets [Yan Zha and Satoru Hayami, Phys. Rev. B 111, 165155 (2025)}], we perform a comprehensive theoretical investigation on the role of multiorbital effects, magnetic anisotropy, and momentum-based frustrated exchange interactions in stabilizing such topologically nontrivial magnetic textures. By employing self-consistent mean-field calculations over a broad range of model parameters, we demonstrate that the cooperative interplay among multiorbital effects, frustrated exchange interactions at higher-harmonic wave vectors, and crystal-field anisotropy is crucial for the stabilization of the S-SkL. Furthermore, the competition between the easy-plane intraorbital coupling and the easy-axis interorbital coupling leads to a significant enhancement of the S-SkL stability region. We also identify a plethora of multi-Q states, including magnetic bubble lattice and double-Q phases with a local/global scalar chirality. Our findings elucidate the microscopic mechanism responsible for the emergence of S-SkLs in Ce-based magnets and provide a route toward realizing skyrmion lattices in a broader class of f-electron materials beyond conventional Gd- and Eu-based systems lacking orbital angular momentum.
Recommended citation: Y. S. Zha and S. Hayami, Effects of crystal field and momentum-based frustrated exchange interactions on multiorbital square skyrmion lattice (2025), arXiv:2511.05896 [cond-mat.str-el].