{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"cb0769459eaeeb989d37e4c2ed645b81ac925a21e8966afc7d65dd0c2883d888","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["14d6bdbedaa17ee5e162a701566cff20ea13b9e48b67d9639ce58c98f562761e","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"03aff1a69dff6835588b9c0b46948373b0742ca107ead47dd13f205049597d07","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":"2","parents":[],"plain":"In $\\mathrm{UTe_2}$, 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 $\\mathrm{UTe_2}$ 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":"14d6bdbedaa17ee5e162a701566cff20ea13b9e48b67d9639ce58c98f562761e","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 $\\mathrm{UTe_2}$ above 400 kG","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"d5a77884e1ba4100fad8815b07644a6b3f4896a0c87dedda2598675f6576a675","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"997817ebeb04c918b006d5657450221db4677e6db02837f88e8e97b7a217c859","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"S4_NwMcVJTpE1sWQJNwdrUH-bwg5PjcW3pNhCoIzi0CIEbSgXRLcyX-mifBIVsInavjX86D4eQuzDYaMNYVPAg"},"schema":"pubphys.envelope/1"},"record_hash":"d5a77884e1ba4100fad8815b07644a6b3f4896a0c87dedda2598675f6576a675","leaf_index":2834}