The search for unconventional superconductivity in Weyl semimetal materials is currently an exciting pursuit, since such superconducting phases could potentially be topologically nontrivial and host exotic Majorana modes. The layered material TaIrTe₄ is a newly predicted time-reversal invariant type II Weyl semimetal with minimum number of Weyl points. Here, we report the discovery of surface superconductivity in Weyl semimetal TaIrTe₄. Our scanning tunneling microscopy/spectroscopy (STM/S) visualizes Fermi arc surface states of TaIrTe₄ that are consistent with the previous angle-resolved photoemission spectroscopy (ARPES) results. By a systematic study based on STS at ultralow temperature, we observe uniform superconducting gaps on the sample surface. The superconductivity is further confirmed by electrical transport measurements at ultralow temperature, with an onset transition temperature (T_c) up to 1.54 K being observed. The normalized upper critical field h*(T/Tc) behavior and the stability of the superconductivity against the ferromagnet indicate that the discovered superconductivity is unconventional with the p-wave pairing. The systematic STS, thickness and angular dependent transport measurements reveal that the detected superconductivity is quasi-one-dimensional (quasi-1D) and occurs in the surface states. The discovery of the surface superconductivity in TaIrTe₄ provides a new novel platform to explore topological superconductivity and Majorana modes.

中文翻译：

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II 型外尔半金属 TaIrTe4 的表面超导


目前，在外尔半金属材料中寻找非常规超导性是一项令人兴奋的追求，因为这种超导相可能在拓扑上非常重要，并且具有奇异的马约拉纳模式。层状材料TaIrTe ₄是一种新预测的时间反转不变的II型Weyl半金属，具有最少的Weyl点数量。在这里，我们报告了外尔半金属 TaIrTe ₄表面超导性的发现。我们的扫描隧道显微镜/光谱 (STM/S) 可视化了 TaIrTe ₄的费米弧表面态，这与之前的角分辨光电子能谱 (ARPES) 结果一致。通过基于超低温STS的系统研究，我们观察到样品表面均匀的超导间隙。通过超低温下的电传输测量进一步证实了超导性，观察到的起始转变温度 (T _c ) 高达 1.54 K。归一化的上临界场 h*(T/Tc) 行为和超导对铁磁体的稳定性表明，所发现的超导与 p 波配对是非常规的。系统的 STS、厚度和角度相关输运测量表明，检测到的超导性是准一维（准一维）的，并且发生在表面态中。 TaIrTe ₄表面超导性的发现为探索拓扑超导性和马约拉纳模式提供了一个新的平台。