论文标题
本地非中心对称超导体CERH $ _2 $的二维XY型磁性特性为$ _2 $
Two-dimensional XY-type Magnetic Properties of Locally Noncentrosymmetric Superconductor CeRh$_2$As$_2$
论文作者
论文摘要
我们执行了$^{75} $ AS-NMR测量结果，以研究CERH $ _2 $的正常磁性特性为$ _2 $，这是最近发现的重型纤维超导体。 AS（2）站点上骑士移动的幅度和温度依赖性表示CERH $ _2 $中的易于平面型磁各向异性为$ _2 $。关于旋转波动，核自旋晶格松弛率的温度依赖性$ 1/t_1 $由4 $ f $电子产生的降低是由于高温恒定行为在冷却下以$ \ sim $ 40〜K的冷却，这是重毛系系统的典型行为。此外，$ 1/t_1 $在低温下变为恒定，表明在空间上是二维抗磁力波动。实际空间中的二维磁相关性在重毛顶超导体中很少见，它们可能是CERH $ _2 $ as $ _2 $的独特超导多相的关键因素。
We performed $^{75}$As-NMR measurements to investigate the normal-state magnetic properties of CeRh$_2$As$_2$, a recently-discovered heavy-fermion superconductor. The magnitude and temperature dependence of the Knight shift at the As(2) site indicate easy-plane-type magnetic anisotropy in CeRh$_2$As$_2$. With regard to spin fluctuations, the temperature dependence of the nuclear spin-lattice relaxation rate $1/T_1$ arising from the 4$f$ electrons decreases from high-temperature constant behavior on cooling at $\sim$ 40~K, which is typical behavior of heavy-fermion systems. In addition, $1/T_1$ becomes constant at low temperatures, suggesting spatially two-dimensional antiferromagnetic fluctuations. Two-dimensional magnetic correlations in the real space are quite rare among heavy-fermion superconductors, and they may be a key factor in the unique superconducting multi-phase in CeRh$_2$As$_2$.
