Magnetic Weyl semimetals (WSMs) with broken time-reversal symmetry (TRS) hosting topological band structures are expected to provide an ideal platform for investigating topological superconductivity and spintronics. However, the experimental verification of magnetic WSMs is very challenging. Very recently, the kagome magnet Co₃Sn₂S₂ was confirmed to be a magnetic WSM by both angle-resolved photoemission spectroscopy and scanning tunneling spectroscopy and consequently has become the focus of great attention. This paper reports a point-contact Andreev-reflection spectroscopy (PCARS) investigation on the (001) surface and the side surface of the Co₃Sn₂S₂ single crystals, respectively. The measurements from the sample's (001) and side surfaces provide experimental evidence for transport spin polarization in the Co₃Sn₂S₂ magnetic WSM. Furthermore, the superconducting proximity effect in the Co₃Sn₂S₂ single crystal is successfully detected. The point-contact spectra (PCS) along the in-plane direction cannot be well fitted by theoretical models based on s-wave pairing, indicating that possible triplet p-wave superconductivity may be triggered at the interface, which paves the way for the future exploration of the topological superconductivity and Majorana states in broken TRS WSMs.

中文翻译：

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磁性Weyl半金属Co 3 Sn 2 S 2的点接触安德列夫反射研究

具有破裂的时间反转对称性（TRS）的拓扑带结构的磁性Weyl半金属（WSM）有望为研究拓扑超导性和自旋电子学提供理想的平台。但是，磁性WSM的实验验证非常具有挑战性。最近，通过角分辨光发射光谱法和扫描隧穿光谱法都证实了kagome磁体Co ₃ Sn ₂ S ₂是磁性WSM，因此已经成为备受关注的焦点。本文报道了Co ₃ Sn ₂ S ₂的（001）表面和侧面的点接触安德列夫反射光谱（PCARS）研究单晶分别。样品（001）和侧面的测量结果为Co ₃ Sn ₂ S ₂磁性WSM中的传输自旋极化提供了实验证据。此外，成功地检测到了Co ₃ Sn ₂ S ₂单晶中的超导邻近效应。基于s波对的理论模型无法很好地拟合沿面方向的点接触谱（PCS），这表明可能在界面处触发了可能的三重态p波超导性，这为未来铺平了道路断裂的TRS WSMs中的拓扑超导和马约拉纳状态的探索。