Regensburg 2022 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 22: Unconventional Superconductors
TT 22.11: Vortrag
Mittwoch, 7. September 2022, 18:15–18:30, H10
High-field superconductivity in UTe2 — •Toni Helm1,2, Motoi Kimata3, Kenta Sudo3, Julia Stirnat1,5, Atsuhiko Miyata1, Markus König2, Tobias Förster1, Jean-Pascal Hornung1,5, Gerard Lapertot4, Jean-Pascal Brison4, Alexandre Pourret4, Georg Knebel4, Dai Aoki3, and Jochen Wosnitza1,5 — 1Dresden High Magnetic Field Laboratory, HZDR, Germany — 2MPI CPfS Dresden, Germany — 3Tohoku University, Oarai, Ibaraki, Japan — 4CEA, IRG-PHELIQs, Grenoble, France — 5Technical University Dresden, Gremany
The potential spin-triplet superconductor UTe2 with Tc=1.6 K has attracted a lot of attention recently. The material is a highly anisotropic paramagnet that exhibits a metamagnetic transition at HM=35 T. In addition to its field-enhanced and pressure-induced superconducting ground state, high-field superconductivity (hfSC) was observed setting in for a particular field orientation just above HM. We investigated magnetortransport and magnetic torque in pulsed magnetic fields up to 70 T for FIB-microfabricated samples of UTe2. Our findings confirm the existence of the hfSC above 40 T for a narrow angular range around ≈ 30∘ tilt off the b axis. The upper critical field, Hc2, reaches almost 75 T and exhibits a temperature dependence that strongly deviates from the low-field SC phase. Excitingly, the Hall effect experiences a drastic suppression for field orientations exactly where the hfSC emerges. The anomalous angle-dependence in high field poses a challenge to the theoretical understanding of the electronic ground state of UTe2.