A square skyrmion lattice in multi-orbital $f$-electron systems

• DOI: 10.48550/arxiv.2502.11765
• Publication Date: 2025-02-17
• Authors: Yuguo Zha; Satoru Hayami
• Keywords: Skyrmion; Square lattice; Square (algebra); Lattice (music)

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