{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"f93172d3edc77a5d18d3b20078c8611698d30c30444ae1fa2964dc566bee0a3b","created":"2026-10-03T07:17:59Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"31a1864df35b9b3743c9669a33177e01aed45d4a3f40143e10bf1cad9863ef74","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"mechanism","assisted_by":[],"external_id":"cm.heavy-fermion-sc.ute2-field-reentrance","kind":"phenomenon","literature_status":"contested","n":"1","parents":[],"plain":"In UTe2, superconductivity reappears in magnetic fields of about 400 to 650 kG when the field is tilted at a particular angle, fields far above those that destroy ordinary superconductors.","posed_since":"2019","precise":"In UTe2 with the field tilted from the b axis toward c by roughly 20 to 40 degrees, superconductivity reappears above the metamagnetic transition $H_m \\sim 350\\,\\mathrm{kG}$ and survives to $\\sim 650\\,\\mathrm{kG}$ (Ran et al., Nature Physics 2019). Determine the pairing mechanism and order parameter of this field-polarized phase: triplet pairing mediated by field-enhanced ferromagnetic fluctuations, compensation of the exchange field by the applied field (Jaccarino-Peter mechanism), or pairing on a Fermi surface reconstructed at $H_m$. An answer predicts the angular window and the upper critical field from a model with independently measured parameters.","problem_ref":null,"references":"","settled_by":"Fermi-surface and magnetization measurements across $H_m$ combined with a calculation that reproduces the angular window and upper field of the reentrant phase.","status_note":"Helm et al. (Nature Communications 2024) proposed field-induced compensation of magnetic exchange; no mechanism is agreed.","title":"Mechanism of field-reentrant superconductivity in UTe2 above 400 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