Surface superconductivity in the type II Weyl semimetal TaIrTe(4).
Surface superconductivity in the type II Weyl semimetal TaIrTe(4).
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II 型外尔半金属 TaIrTe4 的表面超导
DOI：
10.1093/nsr/nwz204
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发表时间：
2020-03
影响因子：
20.6
通讯作者：
Wang J
中科院分区：
文献类型：
--
作者：
Xing Y;Shao Z;Ge J;Luo J;Wang J;Zhu Z;Liu J;Wang Y;Zhao Z;Yan J;Mandrus D;Yan B;Liu XJ;Pan M;Wang J
摘要在Weyl半金属材料中寻找非常规超导性是目前一个令人兴奋的追求，因为这样的超导相可能是拓扑非平凡的，并且具有奇异的Majorana模式。层状材料TaIrTe 4是一种新预测的具有最少Weyl点数的时间反演不变的II型Weyl半金属。在这里，我们报告的发现，表面超导Weyl半金属TaIrTe 4。我们的扫描隧道显微镜/光谱（STM/STS）可视化费米弧表面状态TaIrTe 4是与以前的角度分辨光电子能谱结果一致。通过系统的超低温STS研究，我们在样品表面观察到了均匀的超导带隙。在超低温下的电输运测量进一步证实了超导性，观察到的起始转变温度（Tc）高达1.54 K。归一化的上临界场h*（T/Tc）行为和超导性对铁磁体的稳定性表明，所发现的超导性是非常规的p波配对。系统的STS，厚度和角度依赖的传输测量表明，检测到的超导性是准一维的，发生在表面状态。TaIrTe 4表面超导电性的发现为研究拓扑超导电性和Majorana模提供了一个新的平台。
Abstract The search for unconventional superconductivity in Weyl semimetal materials is currently an exciting pursuit, since such superconducting phases could potentially be topologically non-trivial and host exotic Majorana modes. The layered material TaIrTe4 is a newly predicted time-reversal invariant type II Weyl semimetal with the minimum number of Weyl points. Here, we report the discovery of surface superconductivity in Weyl semimetal TaIrTe4. Our scanning tunneling microscopy/spectroscopy (STM/STS) visualizes Fermi arc surface states of TaIrTe4 that are consistent with the previous angle-resolved photoemission spectroscopy 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 (Tc) 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, and thickness- and angular-dependent transport measurements reveal that the detected superconductivity is 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.
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影响因子：
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