Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 24: Unconventional Superconductors
TT 24.1: Hauptvortrag
Mittwoch, 19. März 2025, 09:30–10:00, H31
Possible Origin of High-Field Reentrant Superconductivity in UTe2 — •Toni Helm — Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
Due to its potentially spin-triplet-superconducting ground state, UTe2 (fondly called Ute) has triggered a wave of enthusiasm among condensed-matter researchers since the discovery of superconductivity below 1.6 K in this anisotropic heavy-fermion paramagnet. As the quality of single crystals improved, e.g., Tc was pushed to 2.1 K, some of the fog about Ute’s mysterious properties has cleared. Nevertheless, the excitement has only become stronger as Ute exhibits signatures of multiple superconducting phases with distinct order parameters stabilized by different tuning parameters such as pressure, magnetic field, or field orientation. Particularly, strong magnetic fields applied to Ute appear to not only suppress superconductivity, as expected for a textbook superconductor, but also enhance and enable additional phases in a rare and very unconventional phase diagram.
In this talk, we will look at Ute’s high-field properties and review recent results concerned with the field-induced superconducting phases in this special compound. In particular, we will focus on what is known so far about the reentrant superconductivity that sets in for specific field orientations at field values beyond approximately 40 T. Latest results from experiments in fields up to 70 T have certain implication to the possible origin of the extremely field-robust reentrant superconductivity in UTe2.
[1] T. Helm et al., Nat. Commun. 15 (2024).
Keywords: UTe$_2$; Spin-Triplet Superconductivity; Strongly Correlated Electrons; High Magnetic Field; Unconventional Phase Diagram