Incommensurate antiferromagnetism in UTe2 under pressure

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.

arXiv commentArticle: 17 pages, 4 figures, 64 references Supplementary Information: 6 pages, 6 figures, 7 references

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Cited by in corpus (5)

• UTe${}_2$: a narrow band superconductor
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• Magnetic fluctuations and anisotropy in UTe2: a multi-orbital study based on GGA+U and RPA
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• Electronic structure of UTe${}_2$ under pressure