What stabilizes skyrmion lattices in centrosymmetric magnets like Gd_2PdSi_3? · revision history

Revision 2

Accepted · core change · record

Changes against revision 1:

Title · changed
Revision 1: What stabilizes skyrmion lattices in centrosymmetric magnets like Gd2PdSi3?
Revision 2: What stabilizes skyrmion lattices in centrosymmetric magnets like $\mathrm{Gd_2PdSi_3}$?
Plain · changed
Revision 1: Most skyrmions appear in crystals lacking mirror symmetry, where a twisting interaction favors them. Gd2PdSi3 and GdRu2Si2 have that symmetry yet host very small skyrmions, and the competing explanations involve geometric frustration or interactions carried by conduction electrons.
Revision 2: Most skyrmions appear in crystals lacking mirror symmetry, where a twisting interaction favors them. $\mathrm{Gd_2PdSi_3}$ and $\mathrm{GdRu_2Si_2}$ have that symmetry yet host very small skyrmions, and the competing explanations involve geometric frustration or interactions carried by conduction electrons.
Precise · changed · core
Revision 1: For Gd2PdSi3 (triangular) and GdRu2Si2 (tetragonal), with skyrmion-lattice periods of about 2 to 3 nm, determine which mechanism stabilizes the multi-$q$ state: frustrated RKKY couplings, Fermi-surface-driven biquadratic and four-spin interactions, or dipolar and anisotropy effects. An answer is a microscopic model derived from the measured band structure that reproduces the field-temperature phase diagram and the modulation vectors.
Revision 2: For $\mathrm{Gd_2PdSi_3}$ (triangular) and $\mathrm{GdRu_2Si_2}$ (tetragonal), with skyrmion-lattice periods of about 2 to 3 nm, determine which mechanism stabilizes the multi-$q$ state: frustrated RKKY couplings, Fermi-surface-driven biquadratic and four-spin interactions, or dipolar and anisotropy effects. An answer is a microscopic model derived from the measured band structure that reproduces the field-temperature phase diagram and the modulation vectors.
Settled by
Ab initio spin models compared with resonant x-ray and neutron data over the full phase diagram, plus pressure or doping tuning of the Fermi surface.
Kind
phenomenon
Answer type
mechanism
References
(empty)
Literature status
contested
Status note
(empty)
Posed since
2019

Decisions