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arXiv 2210.09562cond-mat.supr-con
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UTe$_2$中均匀且单相超流体密度的微观成像

Microscopic imaging homogeneous and single phase superfluid density in UTe$_2$

Yusuke Iguchi, Huiyuan Man, S. M. Thomas, Filip Ronning, Priscila F. S. Rosa, Kathryn A. Moler

AI总结:

本文通过微观成像研究UTe$_2$表面磁场与磁化率,发现均匀超流体密度和涡旋,温度依赖无额外扭结,支持$B_{3u}$序参量,排除多相变。

摘要:

自旋三重态超导体UTe$_2$在某些晶体中表现出自发的时间反演对称性破缺和多个超导相,暗示了手性超导电性。在此,我们对UTe$_2$表面附近的局域磁场和磁化率进行了微观成像,观察到均匀的超流体密度$n_s$和均匀的钉扎涡旋。$n_s$的温度依赖性各向异性能隙一致,并且没有显示出在第二相变处预期的额外扭结。我们的发现与准二维费米面情况下占主导的$B_{3u}$超导序参量一致,并且没有提供UTe$_2$中$n_s(T)$存在多个相变的证据。

英文摘要:

The spin-triplet superconductor UTe$_2$ shows spontaneous time-reversal symmetry breaking and multiple superconducting phases in some crystals, implying chiral superconductivity. Here we microscopically image the local magnetic fields and magnetic susceptibility near the surface of UTe$_2$, observing a homogeneous superfluid density $n_s$ and homogeneous pinned vortices. The temperature dependence of $n_s$ is consistent with an anisotropic gap and shows no evidence for an additional kink that would be expected at any second phase transition. Our findings are consistent with a dominant $B_{3u}$ superconducting order parameter in the case of a quasi-2D Fermi surface and provide no evidence for multiple phase transitions in $n_s(T)$ in UTe$_2$.

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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