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 wave vector 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 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 UTe2 will be a key for describing its unconventional superconducting phases. Published by the American Physical Society 2025

中文翻译：

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UTe2 在压力下不相称的反铁磁性

在 UTe2 中发现多个超导相促进了相关电子物理学的研究。这种重费米子顺磁体很快被确定为研究磁性与具有多个自由度的非常规超导性之间相互作用的参考化合物。接近铁磁量子相变最初被认为是作为三重态对超导性的驱动力。然而，我们在这里发现，在压力下建立了长程不相称的反铁磁有序。反铁磁相的传播矢量 km=（0.07,0.33,1） 接近于先前在环境压力下观察到反铁磁波动的波矢量。这些元素支持 UTe2 在环境压力下几乎是反铁磁体。我们的工作需要对磁相互作用和电子特性的演变进行建模的理论，在环境压力下将相关顺磁状态驱动到压力下的长程反铁磁级。更深入地了解 UTe2 中的流动 f 电子磁性将是描述其非常规超导相的关键。 美国物理学会 2025 年出版