{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"74b6284fdcc4dbe136e650c267adf404ac515dc1cd71206d2f9e8d4ddb787b90","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["0bfcff45aa395e7f30d66862080565ab0d093a9d25d8ad7cefea5b7747bc2468","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"71e658a2870d9120c55f0a441b70af48ba614c6f11a0f778bab9b350b13e5ad5","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"classification","assisted_by":[],"external_id":"cm.skyrmion-magnets.lattice-melting-2d","kind":"well-posed","literature_status":"partially-resolved","n":"2","parents":[],"plain":"A sheet of skyrmions can melt like a 2D crystal, possibly through an intermediate hexatic phase that keeps orientation order but loses positional order. Whether this two-step melting is generic, and how pinning changes it, is open.","posed_since":"","precise":"For a 2D skyrmion lattice in a thin chiral magnet, determine whether melting follows the two-step KTHNY scenario (solid to hexatic to liquid via Kosterlitz-Thouless transitions, with $\\eta_6=1/4$ at the hexatic-liquid transition) or a first-order transition, and how quenched pinning changes the sequence. An answer is the measured or simulated phase diagram with correlation-function exponents.","problem_ref":"0bfcff45aa395e7f30d66862080565ab0d093a9d25d8ad7cefea5b7747bc2468","references":"","settled_by":"Real-space imaging of skyrmion positions in clean films across temperature, analyzed for translational and orientational correlations, with simulations using the measured pinning.","status_note":"Huang et al. (Nature Nanotechnology 2020) observed a hexatic skyrmion phase in thin $\\mathrm{Cu_2OSeO_3}$.","title":"How does a two-dimensional skyrmion lattice melt?","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"f959b41616c5efccbf9c022685e73fa2c4f0f94b883bd59f138a008ae90c80fa","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"5ef21f187479915822d39bcf6be5fcc82392ee7ae670ebfcccb56f15a1b9304b","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"7m_czgKu1dzZqTTTrZ__P_R7zCQndeDS1llAgiipKAIseF6GrOjiEw4q38Ovl7KMvbctoF-UKhwL8RNMXx1CAw"},"schema":"pubphys.envelope/1"},"record_hash":"f959b41616c5efccbf9c022685e73fa2c4f0f94b883bd59f138a008ae90c80fa","leaf_index":3036}