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arXiv 2203.08598cond-mat.supr-concond-mat.str-el
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利用奈特位移测量确定UTe $_2$超导序参量

Superconducting order parameter in UTe$_2$ determined by Knight shift measurement

Hiroki Fujibayashi, Genki Nakamine, Katsuki Kinjo, Shunsaku Kitagawa, Kenji Ishida, Yo Tokunaga, Hironori Sakai, Shinsaku Kambe, Ai Nakamura, Yusei Shimizu, Yos… 展开作者

Hiroki Fujibayashi, Genki Nakamine, Katsuki Kinjo, Shunsaku Kitagawa, Kenji Ishida, Yo Tokunaga, Hironori Sakai, Shinsaku Kambe, Ai Nakamura, Yusei Shimizu, Yoshiya Homma, Dexin Li, Fuminori Honda, Dai Aoki

摘要:

利用Knight位移测量方法,研究了U基超导体UTe $_2$在超导态下的自旋磁化率,磁场沿UTe $_2$的易磁化轴($a$轴)方向变化.虽然一个微小的异常归因于SC的抗磁效应,观察到低于SC的转变温度$T_{\rm c}$,在SC状态的$a$轴奈特位移没有显着减少,从正常状态的温度依赖性的外推。这表明自旋磁化率在低于$T_{\rm c}$时几乎不变。考虑到之前对$H \parallel b$和$H \parallel c$的Knight位移结果,确定了自旋-三重态配对中占主导地位的SC态为$B_{\rm 3u}$,这与正常态下的自旋各向异性一致。结果表明,UTe $_2$是一种具有自旋自由度的自旋三重态超导体。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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