{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"2b6bb7143493f36671890ae5baee90c8c4e07c2c424eb1c00359872644916fcd","created":"2026-10-03T07:18:01Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["53a5a16bf95de270ef07a8dec06d7765c4c62474854759438f7af841108ae502","5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"d6e80069684092050f90d11fee5f21b57756792848a4d83fa88df6072c118ed2","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":"1","parents":[{"note":"","parent_revision":"53a5a16bf95de270ef07a8dec06d7765c4c62474854759438f7af841108ae502","relation":"special_case"}],"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 Sr2RuO4, 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":null,"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 Sr2RuO4 Fermi sheets","topic_ref":"4f61e38da4787d938d64771ba627f52a028683729b3f0c7ab15eb99d384306be"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"6ec35792fc502701a3c9c4dc33b0300bee8604e5e02117a58892c72eb62f8402","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"dd9f6559be9339d983b099f9242ee42f69c956c922c8af9f29e538838ebb8759","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"XiVLrq-xmFv8zjF2ZWVdrdN60Tx-NrE-GBLHdVQZJu1pneB_1rEkz_TskW9WsOW86aPdz_38TESfZ7Yj3Wd7AQ"},"schema":"pubphys.envelope/1"},"record_hash":"6ec35792fc502701a3c9c4dc33b0300bee8604e5e02117a58892c72eb62f8402","leaf_index":1175}