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Observation of short-range Yu-Shiba-Rusinov states with threefold symmetry in layered superconductor 2H-NbSe2
Nanoscale ( IF 6.7 ) Pub Date : 2020/03/20 , DOI: 10.1039/d0nr01383h
Xing Yang 1, 2, 3, 4 , Yuan Yuan 1, 2, 3, 4 , Yang Peng 5, 6, 7, 8, 9 , Emi Minamitani 10, 11, 12 , Lang Peng 1, 2, 3, 4 , Jing-Jing Xian 1, 2, 3, 4 , Wen-Hao Zhang 1, 2, 3, 4 , Ying-Shuang Fu 1, 2, 3, 4
Affiliation  

Yu-Shiba-Rusinov (YSR) states arise when magnetic impurities interact with superconductivity. The intricacy of coupling and the nature of the superconductivity determine the behavior of the YSR state, whose detailed correlations are not yet fully understood. Here, we study the YSR state of a single Fe adatom on the surface of 2H-NbSe2 with combined low temperature scanning tunneling microscopy/spectroscopy, density functional theory calculations and tight-binding modeling. It is found that the Fe adatom occupies the hollow site of the Se surface layer. A prominent YSR state close to the Fermi level is observed. The YSR state exhibits a threefold symmetry along the diagonal direction of the Se lattice. The spatial decay of the YSR state follows a behavior in three-dimensional superconductivity. This behavior contrasts with a previous study of imbedded Fe impurities, whose YSR state shows a six-fold symmetry and a two-dimensional long-range decay. According to our theoretical modeling, the coupling configurations affect the adatom-substrate hopping and the interlayer coupling of the substrate. Both factors are crucial for the consequent behavior of the YSR state.

中文翻译:

层状超导体2H-NbSe2中具有三重对称性的短距离Yu-Shiba-Rusinov态的观察

当磁性杂质与超导相互作用时,就会产生Yu-Shiba-Rusinov(YSR)状态。耦合的复杂性和超导电性的性质决定了YSR状态的行为,其详细的相关性尚未完全被理解。在这里,我们研究2H-NbSe 2表面上单个Fe原子的YSR状态结合了低温扫描隧道显微镜/光谱学,密度泛函理论计算和紧密结合模型。发现Fe吸附原子占据了Se表面层的中空部位。观察到接近费米能级的突出的YSR状态。YSR状态沿着Se晶格的对角线方向表现出三重对称性。YSR状态的空间衰减遵循三维超导行为。这种行为与先前对嵌入的Fe杂质的研究形成了鲜明对比,后者的YSR状态显示出六重对称性和二维远距离衰变。根据我们的理论模型,耦合配置会影响吸附原子-基质的跳跃和基质的层间耦合。这两个因素对于YSR状态的后续行为至关重要。
更新日期:2020-04-17
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