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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 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