Field-induced compensation of magnetic exchange as the possible origin of reentrant superconductivity in UTe2

Toni Helm (), Motoi Kimata, Kenta Sudo, Atsuhiko Miyata, Julia Stirnat, Tobias Förster, Jacob Hornung, Markus König, Ilya Sheikin, Alexandre Pourret, Gerard Lapertot, Dai Aoki, Georg Knebel, Joachim Wosnitza and Jean-Pascal Brison
Additional contact information
Toni Helm: Helmholtz-Zentrum Dresden-Rossendorf
Motoi Kimata: Tohoku University
Kenta Sudo: Tohoku University
Atsuhiko Miyata: Helmholtz-Zentrum Dresden-Rossendorf
Julia Stirnat: Helmholtz-Zentrum Dresden-Rossendorf
Tobias Förster: Helmholtz-Zentrum Dresden-Rossendorf
Jacob Hornung: Helmholtz-Zentrum Dresden-Rossendorf
Markus König: Max Planck Institute for Chemical Physics of Solids
Ilya Sheikin: Laboratoire National des Champs Magnétiques Intenses (LNCMI-EMFL), CNRS, UGA
Alexandre Pourret: Univ. Grenoble Alpes, CEA, Grenoble-INP, IRIG, PHELIQS
Gerard Lapertot: Univ. Grenoble Alpes, CEA, Grenoble-INP, IRIG, PHELIQS
Dai Aoki: Tohoku University
Georg Knebel: Univ. Grenoble Alpes, CEA, Grenoble-INP, IRIG, PHELIQS
Joachim Wosnitza: Helmholtz-Zentrum Dresden-Rossendorf
Jean-Pascal Brison: Univ. Grenoble Alpes, CEA, Grenoble-INP, IRIG, PHELIQS

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract The potential spin-triplet heavy-fermion superconductor UTe2 exhibits signatures of multiple distinct superconducting phases. For field aligned along the b axis, a metamagnetic transition occurs at μ0Hm ≈ 35 T. It is associated with magnetic fluctuations that may be beneficial for the field-reinforced superconductivity surviving up to Hm. Once the field is tilted away from the b towards the c axis, a reentrant superconducting phase emerges just above Hm. In order to better understand this remarkably field-resistant superconducting phase, we conducted magnetic-torque and magnetotransport measurements in pulsed magnetic fields. We determine the record-breaking upper critical field of μ0Hc2 ≈ 73 T and its evolution with angle. Furthermore, the normal-state Hall effect experiences a drastic suppression indicative of a reduced band polarization above Hm in the angular range around 30° caused by a partial compensation between the applied field and an exchange field. This promotes the Jaccarino-Peter effect as a likely mechanism for the reentrant superconductivity above Hm.

Date: 2024
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DOI: 10.1038/s41467-023-44183-1

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