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arXiv · 2311.05455

Incommensurate antiferromagnetism in UTe2 under pressure

W. Knafo·T. Thebault·P. Manuel·D. D. Khalyavin·F. Orlandi·E. Ressouche·K. Beauvois·G. Lapertot·K. Kaneko·D. Aoki·D. Braithwaite·G. Knebel·S. Raymond
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Abstract

The discovery of multiple superconducting phases in UTe2 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 km = (0.07,0.33,1) of the antiferromagnetic phase is close to a wavevector where antiferromagnetic fluctuations have previously been observed at ambient pressure. These elements support that UTe2 is a nearly-antiferromagnet at ambient pressure. Our work appeals for theories modelling 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-electrons magnetism in UTe2 will be a key for describing its unconventional superconducting phases.

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W. Knafo, T. Thebault, P. Manuel, D. D. Khalyavin, F. Orlandi, E. Ressouche, K. Beauvois, G. Lapertot, K. Kaneko, D. Aoki, D. Braithwaite, G. Knebel, S. Raymond. 2023-11-09. Incommensurate antiferromagnetism in UTe2 under pressure. https://doi.org/10.1103/physrevx.15.021075

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