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Observation of short-range Yu-Shiba-Rusinov states with threefold symmetry in layered superconductor 2H-NbSe₂

Yang, Xing and Yuan, Yuan and Peng, Yang and Minamitani, Emi and Peng, Lang and Xian, Jing-Jing and Zhang, Wen-Hao and Fu, Ying-Shuang (2020) Observation of short-range Yu-Shiba-Rusinov states with threefold symmetry in layered superconductor 2H-NbSe₂. Nanoscale, 12 (15). pp. 8174-8179. ISSN 2040-3364. doi:10.1039/d0nr01383h.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription Information
Yang, Xing0000-0003-0221-7863
Peng, Yang0000-0002-8868-2928
Zhang, Wen-Hao0000-0003-2386-0305
Fu, Ying-Shuang0000-0001-7876-2812
Additional Information:© 2020 The Royal Society of Chemistry. Submitted 18 Feb 2020; Accepted 19 Mar 2020; First published 20 Mar 2020. This work is funded by the National Key Research and Development Program of China (Grant No. 2017YFA0403501, 2016YFA0401003, 2018YFA0307000), the National Science Foundation of China (Grants No. 11874161, No. 11522431, No. 11474112). Y. P. acknowledges support from the startup fund from California State University, Northridge, as well as support from the IQIM, an NSF physics frontier center funded in part by the Moore Foundation at Caltech. There are no conflicts to declare.
Group:Institute for Quantum Information and Matter
Funding AgencyGrant Number
National Key Research and Development Program of China2017YFA0403501
National Key Research and Development Program of China2016YFA0401003
National Key Research and Development Program of China2018YFA0307000
National Science Foundation of China11874161
National Science Foundation of China11522431
National Science Foundation of China11474112
California State University, NorthridgeUNSPECIFIED
Institute for Quantum Information and Matter (IQIM)UNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
NSF Physics Frontiers CenterUNSPECIFIED
Issue or Number:15
Record Number:CaltechAUTHORS:20200406-084809823
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:102341
Deposited By: Tony Diaz
Deposited On:06 Apr 2020 18:46
Last Modified:16 Nov 2021 18:11

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