论文标题
在压力下，125TE NMR在压力下揭示了抗铁磁和铁磁自旋波动的可能共存
Possible Coexistence of Antiferromagnetic and Ferromagnetic Spin Fluctuations in the Spin-triplet Superconductor UTe2 Revealed by 125Te NMR under Pressure
论文作者
论文摘要
有人建议在新发现的重型弗里米亚超导体UTE $ _2 $中介导的一种由铁磁（FM）自旋波动介导的自旋三型超导状态。但是，最近的中子散射测量结果表明，UTE $ _2 $中存在抗磁磁性（AFM）自旋波动。在这里，我们报告了单晶UTE $ _2 $的$^{125} $ TE核磁共振（NMR）研究，这表明FM和AFM自旋波动在UTE $ _2 $中的共存。由于化合物中的两个不同的TE位点，我们得出结论，FM自旋波动在梯子内占主导地位，而AFM自旋波动起源于晶间磁耦合。尽管系统中存在AFM旋转波动，但梯子中的FM自旋波动可能在ute $ _2 $的自旋三个超导状态的外观中起重要作用。
A spin-triplet superconducting state mediated by ferromagnetic (FM) spin fluctuations has been suggested to occur in the newly discovered heavy-fermion superconductor UTe$_2$. However, the recent neutron scattering measurements revealed the presence of antiferromagnetic (AFM) spin fluctuations in UTe$_2$. Here, we report the $^{125}$Te nuclear magnetic resonance (NMR) studies of a single-crystal UTe$_2$, suggesting the coexistence of FM and AFM spin fluctuations in UTe$_2$. Owing to the two different Te sites in the compound, we conclude that the FM spin fluctuations are dominant within ladders and the AFM spin fluctuations originate from the inter-ladder magnetic coupling. Although AFM spin fluctuations exist in the system, the FM spin fluctuations in the ladders may play an important role in the appearance of the spin-triplet superconducting state of UTe$_2$.
