Incommensurate Antiferromagnetism in UTe2 under Pressure

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Abstract
The discovery of multiple superconducting phases in UTe 2 boosted research on correlated-electron physics. This heavy-fermion paramagnet was rapidly identified as a reference compound to study the interplay between magnetism and unconventional superconductivity with multiple degrees of freedom. The proximity to a ferromagnetic quantum phase transition was initially proposed as a driving force to triplet-pairing superconductivity. However, we find here that long-range incommensurate antiferromagnetic order is established under pressure. The propagation vector k m = ( 0.07 , 0.33 , 1 ) of the antiferromagnetic phase is close to a wave vector where antiferromagnetic fluctuations have previously been observed at ambient pressure. These elements support that UTe 2 is a nearly antiferromagnet at ambient pressure. Our work appeals for theories modeling the evolution of the magnetic interactions and electronic properties, driving a correlated paramagnetic regime at ambient pressure to a long-range antiferromagnetic order under pressure. A deeper understanding of itinerant- f -electron magnetism in UTe 2 will be a key for describing its unconventional superconducting phases. Published by the American Physical Society 2025
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Funding Information
  • Agence Nationale de la Recherche (ANR-20-CE30-0020, ANR-22-CE30-0040, ANR-11-IDEX-0002-02, ANR-10-LABX-0037-NEXT)
  • Japan Society for the Promotion of Science (P22H04933, JP20K20889, JP20H00130, JP20KK0061)
  • Fédération Française de Diffusion Neutronique

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