论文标题
UTE中的超导订单参数$ _2 $由骑士移动测量确定
Superconducting order parameter in UTe$_2$ determined by Knight shift measurement
论文作者
论文摘要
这项研究通过在$ a $ a axis上使用磁场$ h $ $ h $ a $ a $ axis，这是UTE $ _2 $的磁性易于轴，研究了超导体超导（SC）状态的基于U的超导体UTE $ _2 $的旋转易感性。尽管观察到归因于SC磁磁效应的微小异常在SC转换温度$ t _ {\ rm c} $以下，但在SC状态下的$ a $轴骑士移动没有显着降低，在从正常状态依赖性中推断出来。这表明旋转易感性几乎不变，低于$ t _ {\ rm c} $。考虑到以前的骑士偏移结果$ h \ \ parallel b $和$ h \ parallel c $，在旋转三键配对中，主要的SC状态被确定为$ b _ {\ rm 3u} $，这与正常状态下的自旋各向异性一致。目前的结果表明，UTE $ _2 $是具有自由度的自旋三型超导体。
This study investigates the spin susceptibility in U-based superconductor UTe$_2$ in the superconducting (SC) state by using Knight shift measurements for a magnetic field $H$ along the $a$ axis, which is the magnetic easy axis of UTe$_2$. Although a tiny anomaly ascribed to the SC diamagnetic effect was observed just below the SC transition temperature $T_{\rm c}$, the $a$-axis Knight shift in the SC state shows no significant decrease, following the extrapolation from the normal-state temperature dependence. This indicates that the spin susceptibility is nearly unchanged below $T_{\rm c}$. Considering the previous Knight shift results for $H \parallel b$ and $H \parallel c$, the dominant SC state is determined to be $B_{\rm 3u}$ in the spin-triplet pairing, which is consistent with the spin anisotropy in the normal state. The present result shows that UTe$_2$ is a spin-triplet superconductor with spin degrees of freedom.
