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

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Toni Helm - , Helmholtz-Zentrum Dresden-Rossendorf, Max Planck Institute for Chemical Physics of Solids (Author)
  • Motoi Kimata - , Tohoku University (Author)
  • Kenta Sudo - , Tohoku University (Author)
  • Atsuhiko Miyata - , Helmholtz-Zentrum Dresden-Rossendorf (Author)
  • Julia Stirnat - , Chair of Physics of High Magnetic Fields, Helmholtz-Zentrum Dresden-Rossendorf (Author)
  • Tobias Förster - , Helmholtz-Zentrum Dresden-Rossendorf (Author)
  • Jacob Hornung - , Chair of Physics of High Magnetic Fields, Helmholtz-Zentrum Dresden-Rossendorf (Author)
  • Markus König - , Max Planck Institute for Chemical Physics of Solids (Author)
  • Ilya Sheikin - , Université Grenoble Alpes (Author)
  • Alexandre Pourret - , PHELIQS (Author)
  • Gerard Lapertot - , PHELIQS (Author)
  • Dai Aoki - , Tohoku University (Author)
  • Georg Knebel - , PHELIQS (Author)
  • Joachim Wosnitza - , Clusters of Excellence ct.qmat: Complexity and Topology in Quantum Matter, Chair of Physics of High Magnetic Fields, Helmholtz-Zentrum Dresden-Rossendorf (Author)
  • Jean Pascal Brison - , PHELIQS (Author)

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 μ 0 H m ≈ 35 T. It is associated with magnetic fluctuations that may be beneficial for the field-reinforced superconductivity surviving up to H m. Once the field is tilted away from the b towards the c axis, a reentrant superconducting phase emerges just above H m. 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 μ 0 H c2 ≈ 73 T and its evolution with angle. Furthermore, the normal-state Hall effect experiences a drastic suppression indicative of a reduced band polarization above H m 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 H m.

Details

Original languageEnglish
Article number37
JournalNature communications
Volume15
Publication statusPublished - 2 Jan 2024
Peer-reviewedYes

External IDs

PubMed 38167667