{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"831899845ee8e45d24663be1927aea28d7ceb8787b38a0ff44ab7d9870ff31f8","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["774beffcc3fe8c1616ff0bae866bd5aee1e072962237811916b47cf2afb77f3e","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"502888bd87eb8c794259bd788d495ea3f55789e45a96fbc0159e9a2c3c286ca1","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":"2","parents":[],"plain":"$\\mathrm{UTe_2}$ 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 $\\mathrm{UTe_2}$ (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":"774beffcc3fe8c1616ff0bae866bd5aee1e072962237811916b47cf2afb77f3e","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 $\\mathrm{UTe_2}$","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"96b8c41c3fb0921351d4ab87c6feb0fed8b3eabe151b0615cefe5e6b18c9f9ee","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"361c6e4fa958121ad63540508452978d9c16562a80b3c29891f9a30daf916902","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"ZkR7VGAtk0CRSMIkXXt2FMtuijjoQj6Y9uT4f4r92hEMAlGrYXXRGaeuBq_DjWNpL8my-q71bMAC1yP0AHWCAg"},"schema":"pubphys.envelope/1"},"record_hash":"96b8c41c3fb0921351d4ab87c6feb0fed8b3eabe151b0615cefe5e6b18c9f9ee","leaf_index":2836}