open access

https://hdl.handle.net/2115/95546

Square skyrmion lattice in multiorbital f-electron systems

英語

2025-04-30

American Physical Society (APS)

Physical Review B

111(16)

We report the emergence of a square-shaped skyrmion lattice in multiorbital f-electron systems with easy-axis magnetic anisotropy on a centrosymmetric square lattice. By performing mean-field calculations for an effective localized model consisting of two Kramers doublets, we construct the low-temperature phase diagram in a static external magnetic field. Consequently, we find that a square-shaped skyrmion lattice with the skyrmion number of one appears in the intermediate-field region when the crystal field splitting between the two doublets is small. Furthermore, we identify another double-Q state with a nonzero net scalar chirality at zero-and low-field regions, which is attributed to the help of the multiorbital degree of freedom. Our results offer another route to search for skyrmion-hosting materials in centrosymmetric f-electron tetragonal systems with multiorbital degrees of freedom, e.g., Ce-based compounds. This contrasts with conventional other f-electron systems hosting skyrmion lattices, such as Gd-and Eu-based compounds without orbital angular momentum.

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