Field-direction-dependent skyrmion crystals in noncentrosymmetric cubic magnets: A comparison between point groups and
arXiv:2305.14619 · doi:10.1103/PhysRevB.107.174435
Abstract
We investigate the instability toward a skyrmion crystal (SkX) in noncentrosymmetric cubic magnets with an emphasis on a comparison between point groups and . By constructing low-temperature magnetic phase diagrams under an external magnetic field for three directions based on numerically simulated annealing, we find that the system under the point group exhibits different two types of SkXs depending on the field direction, while that under does not show such an instability. The difference between them is understood from the difference in the momentum-dependent Dzyaloshinskii-Moriya interaction under each point group. Meanwhile, we show that the system under leads to the SkX instability by considering an additional effect of the uniaxial strain, which lowers the symmetry to . We obtain two different SkXs: Néel-type and anti-type SkXs, the former of which is stabilized in the presence of the interactions at the three-dimensional ordering wave vectors. The present results provide rich topological spin textures in the three-dimensional systems, which are sensitive to the magnetic-field direction and point-group symmetry.
11 pages, 11 figures, accepted for publication in PRB
References in corpus (14)
- Spontaneous Skyrmion Ground States in Magnetic Metals
- Long wavelength helimagnetic order and skyrmion lattice phase in Cu2OSeO3
- Skyrmions and Anomalous Hall Effect in a Dzyloshinskii-Moriya Spiral Magnet
- Theory of the helical spin crystal: a candidate for the partially ordered state of MnSi
- Formation and rotation of skyrmion crystal in the chiral-lattice insulator Cu2OSeO3
- Theory of helical spin crystals: phases, textures and properties
- Noncoplanar multiple- spin textures by itinerant frustration: Effects of single-ion anisotropy and bond-dependent anisotropy
- Field-Direction Sensitive Skyrmion Crystals in Cubic Chiral Systems: Implication to -Electron Compound EuPtSi
- Effective spin model in momentum space: Toward a systematic understanding of multiple- instability by momentum-resolved anisotropic exchange interactions
- Spin excitation spectra in helimagnetic states: proper-screw, cycloid, vortex crystal, and hedgehog lattice
- Magnetic field-temperature phase diagrams for multiple- magnetic orderings: Exact steepest descent approach to long-range interacting spin systems
- Phase degree of freedom and topology in multiple- spin textures
- Anisotropic spin model and multiple- states in cubic systems
- Hidden Topological Transitions in Emergent Magnetic Monopole Lattices