Aggarwal Leena, Singh Chandan K, Aslam Mohammad, Singha Ratnadwip, Pariari Arnab, Gayen Sirshendu, Kabir Mukul, Mandal Prabhat, Sheet Goutam
Department of Physical Sciences, Indian Institute of Science Education and Research Mohali, Sector 81, S. A. S. Nagar, PO: 140306, Manauli, India.
J Phys Condens Matter. 2019 Dec 4;31(48):485707. doi: 10.1088/1361-648X/ab3b61. Epub 2019 Sep 5.
ZrSiS was recently shown to be a new material with topologically non-trivial band structure that exhibits multiple Dirac nodes and a robust linear band dispersion up to an unusually high energy of 2 eV. Such a robust linear dispersion makes the topological properties of ZrSiS insensitive to perturbations like carrier doping or lattice distortion. Here, we show that a novel superconducting phase with a remarkably high [Formula: see text] of 7.5 K can be induced in single crystals of ZrSiS by a non-superconducting metallic tip of Ag. From first-principles calculations, we show that the observed superconducting phase might originate from a dramatic enhancement of density of states due to the presence of a metallic tip on ZrSiS. Our calculations also show that the emerging tip-induced superconducting phase co-exists with the well preserved topological properties of ZrSiS.
最近研究表明，ZrSiS是一种具有非平凡拓扑能带结构的新型材料，它展现出多个狄拉克节点，并且在高达2电子伏特的异常高能量下具有稳健的线性能带色散。这种稳健的线性色散使得ZrSiS的拓扑性质对诸如载流子掺杂或晶格畸变等扰动不敏感。在此，我们表明，通过Ag的非超导金属尖端，可以在ZrSiS单晶中诱导出一种具有高达7.5 K的显著高转变温度（[公式：见原文]）的新型超导相。从第一性原理计算可知，观察到的超导相可能源于ZrSiS上存在金属尖端导致的态密度显著增强。我们的计算还表明，新出现的尖端诱导超导相与ZrSiS完好保留的拓扑性质共存。
