{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"b77971cc8f73bfef12d7e50e7e3d0408d88507cddbc6a130521302d802b7ff31","created":"2026-10-03T07:17:59Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"dffce1fce1ddea5469d412aad3e29f1d968efba33c317488da96eb1a5983be3d","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"identification","assisted_by":[],"external_id":"cm.heavy-fermion-sc.ute2-order-parameter","kind":"well-posed","literature_status":"contested","n":"1","parents":[],"plain":"UTe2 is a heavy-fermion superconductor whose electron pairs probably have parallel spins (spin-triplet), but the exact pairing pattern is still argued over.","posed_since":"2019","precise":"Determine the irreducible representation of the superconducting order parameter of orthorhombic UTe2 (point group D2h; candidates B3u, B2u, Au, or multicomponent combinations) at ambient pressure and zero field, including node positions and whether time-reversal symmetry is broken. An answer is a set of measurements (Knight shift along a, b, c; directional thermal conductivity; polar Kerr; quasiparticle interference of surface states) consistent with one representation.","problem_ref":null,"references":"","settled_by":"Knight shift along all three axes in high-quality crystals plus a phase-sensitive surface probe that singles out one representation.","status_note":"Odd-parity pairing is supported by several probes; resonant ultrasound (2024) indicates a single-component order parameter, thermal conductivity (2026) reports point-like gap minima that do not reach zero, and polar Kerr evidence for time-reversal breaking was not reproduced in cleaner crystals (2023).","title":"Symmetry of the superconducting order parameter of UTe2","topic_ref":"42e2b4fc8c37f8d74e57ec83f9086a24e04ebe52927fdc7a9b95f3d2fc3088c5"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"774beffcc3fe8c1616ff0bae866bd5aee1e072962237811916b47cf2afb77f3e","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"eaef443292f588931be923a5fa0783269896e23bbaccef46e92ee9609efe9b6a","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"woE-M-aULmWRj7kVge5EoDZ6VC3S8CVTnffaGV-4Q6Fs0t8tOPXLSf_Ifs_GYlbXEZrtdJRJYX1HYmK8hcsuBQ"},"schema":"pubphys.envelope/1"},"record_hash":"774beffcc3fe8c1616ff0bae866bd5aee1e072962237811916b47cf2afb77f3e","leaf_index":1012}