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

Author

Listed:
  • Toni Helm

    (Helmholtz-Zentrum Dresden-Rossendorf
    Max Planck Institute for Chemical Physics of Solids)

  • Motoi Kimata

    (Tohoku University)

  • Kenta Sudo

    (Tohoku University)

  • Atsuhiko Miyata

    (Helmholtz-Zentrum Dresden-Rossendorf)

  • Julia Stirnat

    (Helmholtz-Zentrum Dresden-Rossendorf
    Technische Universität Dresden)

  • Tobias Förster

    (Helmholtz-Zentrum Dresden-Rossendorf)

  • Jacob Hornung

    (Helmholtz-Zentrum Dresden-Rossendorf
    Technische Universität Dresden)

  • 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
    Technische Universität Dresden)

  • Jean-Pascal Brison

    (Univ. Grenoble Alpes, CEA, Grenoble-INP, IRIG, PHELIQS)

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.

Suggested Citation

  • 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 &, 2024. "Field-induced compensation of magnetic exchange as the possible origin of reentrant superconductivity in UTe2," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-023-44183-1
    DOI: 10.1038/s41467-023-44183-1
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    References listed on IDEAS

    as
    1. Lin Jiao & Sean Howard & Sheng Ran & Zhenyu Wang & Jorge Olivares Rodriguez & Manfred Sigrist & Ziqiang Wang & Nicholas P. Butch & Vidya Madhavan, 2020. "Chiral superconductivity in heavy-fermion metal UTe2," Nature, Nature, vol. 579(7800), pages 523-527, March.
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