{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"c84494447f6e36fdf6b55605cbb09878561b8880752f627c36005897c766081e","created":"2026-10-03T07:18:00Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"9a69ae24bc4c79b3731be643eb0d65ee777bd2653db6e92b4b1140d80ccafd22","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"identification","assisted_by":[],"external_id":"cm.kagome-metals.sc-gap-structure","kind":"well-posed","literature_status":"contested","n":"1","parents":[],"plain":"Whether the superconducting gap of these kagome metals vanishes somewhere on the Fermi surface, and whether it changes sign, is disputed.","posed_since":"2021","precise":"Determine the gap structure of AV3Sb5 superconductors (nodal or nodeless, sign-changing or not) and its dependence on the charge-density-wave state, for example under pressure where $T_{c}$ has two domes. An answer is penetration depth, thermal conductivity and phase-sensitive measurements on the same crystals, with controlled disorder to test sign change.","problem_ref":null,"references":"","settled_by":"Penetration depth with electron-irradiation series and thermal conductivity, plus quasiparticle interference sign tests.","status_note":"Penetration depth with controlled electron irradiation (2023) points to a nodeless sign-preserving gap; other reports infer nodes.","title":"Superconducting gap structure of AV3Sb5","topic_ref":"b07aceae6ac0e1690fea48db269288e8ac55a50f722f8f0e6cf26c1685ae1e5a"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"1f308192c9ae47faf1062ca06ea9b3b7d4a76e2752c21df085b1bac4425ea2fd","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"5b0096c95ed65df5ece8bbc35b86c48febc769866ed4d10cc69e3b4e12b97c5d","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"frrUxShSWRWDZRaXNPfQDd4A1OsRM5Pa52m_jSdW52a-AxEDGDjq5rX8dNuc9QVm2PZhsLA8BEIRLgH-OlL2Bg"},"schema":"pubphys.envelope/1"},"record_hash":"1f308192c9ae47faf1062ca06ea9b3b7d4a76e2752c21df085b1bac4425ea2fd","leaf_index":1053}