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TT: Fachverband Tiefe Temperaturen
TT 24: Unconventional Superconductors
TT 24.2: Vortrag
Mittwoch, 19. März 2025, 10:00–10:15, H31
Fermi surface studies on UTe2 — •F. Husstedt1,2, B. V. Schwarze1, J. P. Brison3, G. Knebel3, G. Lapertot3, M. Kimata4, D. Aoki4, T. Helm1, and J. Wosnitza1,2 — 1Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, HZDR, Germany — 2Institut für Festkörper- und Materialphysik, TU Dresden, Germany — 3Centre CEA de Grenoble, France — 4Institute for Materials Research, Tohoku University, Japan
To date, the presence of three-dimensional (3D) Fermi surfaces in the heavy-fermion superconductor UTe2 is strongly debated. We had access to high-quality UTe2 single crystals with Tc = 2 K to perform angle-dependent measurements of the magnetic torque, magnetotransport, and Hall effect. The observed quantum oscillations provide further insight into the electronic structure of UTe2. We measured de Haas-van Alphen frequencies that show a very good agreement with previous reports. Consistent with two-dimensional Fermi-surface cylinders, we also observed a 100 T Shubnikov-de Haas (SdH) frequency for field oriented along the crystallographic a axis. We investigated the angular dependence of this frequency in the a-b plane as well as in the a-c plane to clarify if it may originate from a 3D Fermi surface. The temperature dependence of the 100 T SdH frequency reveals an effective mass much lower than the ones reported for the fundamental frequencies.
Keywords: unconventional superconductors; high magnetic fields; electronic structure; heavy fermions