UTe2压力诱导超导穹顶内的隐藏磁序
Hidden magnetic order within the pressure induced superconducting dome of UTe2
- New Cornerstone Science Laboratory, Center for Correlated Matter and School of Physics, Zhejiang University（浙江大学相关物质研究中心新Cornerstone科学实验室）
- National Key Laboratory of Surface Physics and Chemistry（表面物理与化学国家重点实验室）
- Nanhu Laser Laboratory（南湖激光实验室）
- Max Planck Inst（马克斯·普朗克研究所）
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中文总结 AI 辅助
本研究通过压力与磁场下的UTe2测量，发现压力诱导超导穹顶内存在隐藏反铁磁序，其相边界外推至与超导最大转变温度重合的量子临界点，表明该磁序可能是驱动三重态超导的母体磁相。
中文摘要 AI 辅助
非常规超导通常出现在磁不稳定性附近，相应的自旋涨落被广泛认为在介导电子配对中起着关键作用。UTe$_2$是在施加压力和磁场时表现出多种自旋三重态超导相的有前景候选材料，但驱动这些非常规配对态的磁性本质尚未确定。我们对UTe$_2$在施加压力和磁场下的测量揭示了压力诱导超导穹顶内存在一种隐藏的磁序，当压力足够高以诱导三维反铁磁相时，该磁序与超导性一同消失。对隐藏磁序（很可能本质上是反铁磁性的）相边界的外推指向一个零温量子临界点，该点与压力诱导超导穹顶的最大转变温度重合，表明它可能是驱动三重态超导的临界反铁磁自旋涨落的母体磁相。这些发现推进了对典范候选三重态超导体中磁性与超导相互作用的理解，这对于揭示不同非常规超导相的微观起源是必要的。
英文摘要
Unconventional superconductivity typically occurs near magnetic instabilities, and the corresponding spin fluctuations are widely believed to play a crucial role in mediating electron pairing. UTe$_2$ is a promising candidate for exhibiting multiple spin-triplet superconducting phases when tuning with applied pressure and magnetic fields, but the nature of the magnetism driving these unconventional pairing states is undetermined. Our measurements of UTe$_2$ under applied pressures and magnetic fields reveal the presence of a magnetic order hidden within the pressure-induced superconducting dome, which vanishes together with the superconductivity once there is sufficiently high pressure to induce the three-dimensional antiferromagnetic phase. Extrapolation of the phase boundary of the hidden magnetic order, which is most likely antiferromagnetic in nature, points to a zero-temperature quantum critical point that coincides with the maximum transition temperature of the pressure-induced superconducting dome, suggesting that it could corresponds to the parent magnetic phase of the critical antiferromagnetic spin fluctuations driving the triplet superconductivity. These findings advance the understanding of the interplay of magnetism and superconductivity in an exemplar candidate triplet superconductor, which is necessary for revealing the microscopic origin of the different unconventional superconducting phases.
