论文标题
ND1-XSRXNIO2膜中具有不同对称性的两个超导组件
Two superconducting components with different symmetries in Nd1-xSrxNiO2 films
论文作者
论文摘要
铜酸盐中的配对机制仍然是凝聚态物理学领域中最具挑战性的问题之一。 Cu2+离子状态的独特的3D9电子轨道被认为是出现超导性的主要参与者。最近，在镍ND1-XSRXNIO2（X = 0.1-0.2）的无限层薄膜中发现了大约9-15 K的超导性，据信具有相似的3D9轨道电子。这里有关的关键问题是关于超导差距函数。在这里，我们报告了超导镍薄膜上的单个粒子隧穿测量值的第一组数据。我们发现主要两种类型的隧道光谱，一种显示了V形特征，可以很好地通过D-Wave Gap功能很好地拟合，间隙最大约为3.9 MeV，另一种显示了约2.35 MeV的全间隙。一些光谱表明了这两个组成部分的不同贡献。我们的结果表明，新发现的基于NI的超导体与铜酸盐的类似物相似，因此证明了非常规超导性的共同点。
The pairing mechanism in cuprates remains as one of the most challenging issues in the field of condensed matter physics. The unique 3d9 electron orbital of the Cu2+ ionic states in cuprates is supposed to be the major player for the occurrence of superconductivity. Recently, superconductivity at about 9-15 K was discovered in infinite layer thin films of nickelate Nd1-xSrxNiO2 (x=0.1-0.2) which is believed to have the similar 3d9 orbital electrons. The key issue concerned here is about the superconducting gap function. Here we report the first set data of single particle tunneling measurements on the superconducting nickelate thin films. We find predominantly two types of tunneling spectra, one shows a V-shape feature which can be fitted very well by a d-wave gap function with gap maximum of about 3.9 meV, another one exhibits a full gap of about 2.35 meV. Some spectra demonstrate mixed contributions of these two components. Our results suggest that the newly found Ni-based superconductors play as close analogs to cuprates, and thus demonstrate the commonality of unconventional superconductivity.
