Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 29: Unconventional Superconductors
TT 29.1: Talk
Tuesday, March 10, 2026, 09:30–09:45, CHE/0091
Investigation of the field-dependent phase diagram of UTe2 — •F. Husstedt1,2, M. Kimata3, S. Naduvile Thadathil1,2, M. König5, G. Lapertot4, J.-P. Brison4, G. Knebel4, J. Wosnitza1,2, and T. Helm1 — 1Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ctd.qmat, HZDR, Germany — 2Institut für Festkörper- und Materialphysik, TU Dresden, Germany — 3Institute for Materials Research, Tohoku University, Japan — 4Centre CEA de Grenoble, France — 5Max Planck Institute for Chemical Physics of Solids, Dresden, Germany
While the general shape of the UTe2 superconducting (SC) phase diagram is already known, there are still investigations ongoing regarding the details of the SC states. This includes, for example, the shape and nature of the high-field reentrant SC phase near the crystallographic b axis as well as multiple superconducting phases at lower fields.
Especially interesting is the case for field applied parallel to the b axis. The phase diagram proposed by Rosuel et al. [1] contains two second-order phase transition lines meeting, which is thermodynamically forbidden [2]. This problem could be resolved by a fourth line emerging from this point. The first indication of such a line was proposed by Sakai et al. [3].
We performed transport studies on a microfabricated sample to get deeper insight in the phase diagram for both the a axis and b axis as well as the angle-dependent behavior of the emergent phases.
[1] Rosuel et al., PRX 13, 011022 (2023)
[2] Yip et al., PRB 43, 2742 (1991)
[3] Sakai et al., PRL 130, 196002 (2023)
Keywords: unconventional superconductors; high magnetic fields; heavy fermions