open access

https://hdl.handle.net/2115/99925

Effects of crystal field and momentum-based frustrated exchange interactions on multiorbital square skyrmion lattice

英語

2026-05-01

American Physical Society

Physical Review B

113(17)

Motivated by recent theoretical predictions of a square-shaped skyrmion lattice (S-SkL) in centrosymmetric tetragonal Ce-based magnets [Y. Zha and S. Hayami, Phys. Rev. B 111, 165155 (2025)], we perform a comprehensive theoretical investigation into the role of multiorbital effects and momentum-based frustrated exchange interactions in stabilizing such topologically nontrivial magnetic textures. By employing self-consistent meanfield calculations over a broad range of model parameters, we demonstrate that the cooperative interplay among interorbital coupling, frustrated exchange interactions at higher-harmonic wave vectors, and crystal-field-induced anisotropy is crucial for the stabilization of the S-SkL. Furthermore, the competition between the easy-plane intraorbital anisotropy and the easy-axis interorbital anisotropy leads to a significant enhancement of the S-SkL stability region. We also identify a rich variety of multi-Q states, including a topologically nontrivial S-SkL state with a slight breaking of fourfold rotational symmetry (S-SkL'), magnetic bubble lattices (MBLs), and double-Q phases with a local/net scalar chirality. Our findings elucidate the microscopic mechanism responsible for the emergence of S-SkLs in prototypical 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.

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