Mechanism of field-reentrant superconductivity in UTe_2 above 400 kG · revision history

Revision 2

Accepted · core change · record

Changes against revision 1:

Title · changed
Revision 1: Mechanism of field-reentrant superconductivity in UTe2 above 400 kG
Revision 2: Mechanism of field-reentrant superconductivity in $\mathrm{UTe_2}$ above 400 kG
Plain · changed
Revision 1: 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.
Revision 2: 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.
Precise · changed · core
Revision 1: 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.
Revision 2: 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.
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.
Kind
phenomenon
Answer type
mechanism
References
(empty)
Literature status
contested
Status note
Helm et al. (Nature Communications 2024) proposed field-induced compensation of magnetic exchange; no mechanism is agreed.
Posed since
2019

Decisions