{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"1dd12fb760bcf88d7499e4da1b6f5b2656ebd2c3112008492074d06f92b760cf","created":"2026-10-03T07:18:01Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"7a17e0fa911ab311d7fed02ba55fcd5f886c79518a3f004faa07b9a01e79150c","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"identification","assisted_by":[],"external_id":"cm.sr2ruo4.order-parameter","kind":"well-posed","literature_status":"contested","n":"1","parents":[],"plain":"The pairing pattern of Sr2RuO4 must explain conflicting data: some measurements suggest a two-part order that breaks time-reversal symmetry, while others see only one transition.","posed_since":"1995","precise":"Determine the order parameter of Sr2RuO4 ($T_c = 1.5\\,\\mathrm{K}$): parity, spin structure, orbital and band content, and irreducible representation of D4h, consistent with the drop of the 17O Knight shift for in-plane fields (2019), the ultrasound jump in shear modulus $c66$ suggesting two components, muSR and polar Kerr time-reversal breaking, and no second heat-capacity anomaly under uniaxial stress. Candidates include d_xz + i d_yz, s' + i d_x2-y2, d + i g and interorbital pairing states.","problem_ref":null,"references":"","settled_by":"A single order parameter that quantitatively fits Knight shift, ultrasound, muSR, Kerr and strain-dependent heat capacity, confirmed by a phase-sensitive measurement.","status_note":"","title":"What is the superconducting order parameter of Sr2RuO4","topic_ref":"4f61e38da4787d938d64771ba627f52a028683729b3f0c7ab15eb99d384306be"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"53a5a16bf95de270ef07a8dec06d7765c4c62474854759438f7af841108ae502","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"88e6522dfccd3b5da2ffc25b8814420ca7fc3c20ca7a630636a3ca602de33315","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"eZy2erPWR2fJE6Q7PxChtUDvrvf6RbasZOzi4eAr89cw51ESn2mhNg4qyDdo5xVtZn8DVg9CZk0lC6tk6DH4CQ"},"schema":"pubphys.envelope/1"},"record_hash":"53a5a16bf95de270ef07a8dec06d7765c4c62474854759438f7af841108ae502","leaf_index":1174}