{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"e72d31d61d86120a09b3c6a8154cab5c6041b9c951ef8b104736c29390800c18","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["6ec35792fc502701a3c9c4dc33b0300bee8604e5e02117a58892c72eb62f8402","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"86dd24b077aa9f9a3d8bd0afc41630b38e6f8de7618a313c4606facddeb05efd","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"identification","assisted_by":[],"external_id":"cm.sr2ruo4.gap-nodes","kind":"well-posed","literature_status":"partially-resolved","n":"2","parents":[],"plain":"Heat-transport data indicate lines on the Fermi surface where the superconducting gap vanishes, and tunneling maps place them along the diagonals on two of the three sheets; whether these are true zeros and what happens on the third sheet is not known.","posed_since":"","precise":"In $\\mathrm{Sr_2RuO_4}$, determine whether the gap features along the zone diagonals [110] on the $\\alpha$ and $\\beta$ sheets are symmetry-required vertical line nodes or deep accidental minima, and determine the gap structure on the $\\gamma$ sheet. An answer is momentum-resolved gap data at $T << T_c$ (ARPES with sub-0.1 meV resolution, quasiparticle interference, or field-angle-resolved specific heat) on all three sheets, resolving node versus minimum.","problem_ref":"6ec35792fc502701a3c9c4dc33b0300bee8604e5e02117a58892c72eb62f8402","references":"","settled_by":"Momentum-resolved gap maps on all three sheets at temperatures well below $T_c$.","status_note":"Thermal conductivity (2017) indicates vertical line nodes, and quasiparticle interference (2020) places nodes or deep minima along the zone diagonals on the $\\alpha$ and $\\beta$ sheets; $\\gamma$-sheet gap structure and true node versus minimum remain open.","title":"Location of gap nodes on the $\\mathrm{Sr_2RuO_4}$ Fermi sheets","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"0f7b8d7ca9aef4e97015dcb2bf69f5809ede0e9528705acb33053e64915a245f","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"395e60f0ca48d76e0396cbff6546c1e5dce5fc465dbf2324128ccdc63acbbf91","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"iMArZAhFBY70rxlqUFQ6FrjjWGexY0Vl68VU1yY7y_uQ-ByjgFeM6izEH1YsCD0KilpPxcUsAsx8-_1WCjFXAA"},"schema":"pubphys.envelope/1"},"record_hash":"0f7b8d7ca9aef4e97015dcb2bf69f5809ede0e9528705acb33053e64915a245f","leaf_index":3052}