Magnetization and superconductivity in UTe2 at high fields
Author: Lewin, Sylvia K.
Affiliation: University of Maryland
Type: Invited Talk
Session: UTe2: magnetism and superconducting memory
Date and Time: 23.07.2026, 11:15 - 11:45
Among many interesting features of UTe2, one of the most striking is its highly anisotropic response to applied magnetic fields. For fields near the crystallographic b axis, a field-reentrant superconducting phase arises and then is cut off at a metamagnetic transition, Hm. Above Hm, superconductivity exists only when the field is tilted roughly 20° away from the b axis in any direction. Such a ring of superconductivity with respect to magnetic field angle has not been observed in other materials and its origin is not yet understood.
Given that this superconducting phase appears above Hm, it is natural to look for a connection between superconductivity and the magnetic state of the material. I will present experimental results on the change in magnetization of UTe2 through Hm as a function of field angle and compare these to the field-angular range of high-field superconductivity. While there are associations in part of the phase diagram, it is clear that there is not a simple connection between the field-angle range of superconductivity and the magnetization of UTe2 at high fields.