{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"cd0f87b8b7ff12cf0a192c8b5fc3298a96ad6baa2629231a1ddfd0dc6ac82905","created":"2026-10-03T07:18:01Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"dc62ba009c9e06e9cd490c6df23aa0e3a1f52f61147f63a60b2eafa7b952e905","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":"1","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":null,"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 Cu2OSeO3.","title":"How does a two-dimensional skyrmion lattice melt?","topic_ref":"51739886d29ed7915aad97df85d96eccb4ca26bfda8367c9539ae8df53e14179"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"0bfcff45aa395e7f30d66862080565ab0d093a9d25d8ad7cefea5b7747bc2468","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"47ab3aaa7ff1c5e8156103db4b97c3794d4ee26a8d3f1a688408e657cdddac7e","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"lowhCS55j3FReD4c4hDdCh2TFrnWP8IdCi1txCNrOV03PvjiZm8_vsMQ3B3THq1R7TDV7dwOzOLnWVWYULehCA"},"schema":"pubphys.envelope/1"},"record_hash":"0bfcff45aa395e7f30d66862080565ab0d093a9d25d8ad7cefea5b7747bc2468","leaf_index":1165}