{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"4aac3a692b6e79483b58a6cde891c8c0753edd2e2d705ca4cb2ac2853d3d24d9","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["23c6b0b7b2b338f800c20d7d64166f3e18a69ab0e72b65ed1c1a69d6c6e0b824","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"75aff286eb581bb91ee71f4a3cb4b116bd024cc516260dd19dc3c2edab8c68bc","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"mechanism","assisted_by":[],"external_id":"cm.skyrmion-magnets.centrosymmetric-mechanism","kind":"phenomenon","literature_status":"contested","n":"2","parents":[],"plain":"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.","posed_since":"2019","precise":"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.","problem_ref":"23c6b0b7b2b338f800c20d7d64166f3e18a69ab0e72b65ed1c1a69d6c6e0b824","references":"","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.","status_note":"","title":"What stabilizes skyrmion lattices in centrosymmetric magnets like $\\mathrm{Gd_2PdSi_3}$?","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"c0d23f3418adff7991c150fcfac2f18fd80c13c555086f216b4faaae9c208a2b","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"de1f98a47c764e9d6404a0a83eafbedc42674e10af4b74c227929209842729c2","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"4J7aDM5Ls75e98VBBXgFlZHnvaa00VBhPuSLRpvpxLS_JFb73yB0miOEGWO9yLnK9wkZNqUpGadC_GI0QkYYAQ"},"schema":"pubphys.envelope/1"},"record_hash":"c0d23f3418adff7991c150fcfac2f18fd80c13c555086f216b4faaae9c208a2b","leaf_index":3034}