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  Closing the superconducting gap in small Pb nanoislands with high magnetic fields

Burgess, J. A. J., Yan, S., Loth, S., & Rolf-Pissarczyk, S. (2016). Closing the superconducting gap in small Pb nanoislands with high magnetic fields. Physical Review B, 94(22): 224504. doi:10.1103/PhysRevB.94.224504.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-8CB6-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-913A-7
Genre: Journal Article

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PhysRevB.94.224504.pdf (Publisher version), 2MB
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https://dx.doi.org/10.1103/PhysRevB.94.224504 (Publisher version)
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https://arxiv.org/abs/1702.03686 (Preprint)
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 Creators:
Burgess, J. A. J.1, 2, Author              
Yan, S.1, 2, Author              
Loth, S.1, 2, Author              
Rolf-Pissarczyk, S.1, 2, Author              
Affiliations:
1Dynamics of Nanoelectronic Systems, Independent Research Groups, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938290              
2Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany, ou_persistent22              

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 Abstract: Superconducting properties change in confined geometries. Here we study the effects of strong confinement in nanosized Pb islands on Si(111) 7×7. Small hexagonal islands with diameters less than 50 nm and a uniform height of seven atomic layers are formed by depositing Pb at low temperature and annealing at 300 K. We measure the tunneling spectra of individual Pb nanoislands using a low-temperature scanning tunneling microscope operated at 0.6 K and follow the narrowing of the superconducting gap as a function of magnetic field. We find the critical magnetic field, at which the superconducting gap vanishes, reaches several Tesla, which represents a greater than 50-fold enhancement compared to the bulk value. By independently measuring the size of the superconducting gap, and the critical magnetic field that quenches superconductivity for a range of nanoislands, we can correlate these two fundamental parameters and estimate the maximal achievable critical field for 7 ML Pb nanoislands to be 7 T.

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Language(s): eng - English
 Dates: 2016-10-012016-06-152016-12-072016-12-07
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1103/PhysRevB.94.224504
arXiv: 1702.03686
 Degree: -

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Project name : The authors thank H. Suderow (Universidad Aut ́ onoma de Madrid) and Christian Ast (Max Planck Institute for Solid State Research, Stuttgart) for valuable discussions and E. Weckert and H. Dosch (Deutsches Elektronen-Synchrotron, Germany) for providing laboratory space. The research leading to these results has received funding from the European Research Council (ERC-2014-StG-633818-dasQ). S.R.P. acknowledges a fellowship from the Studienstiftung des deutschen Volkes (German Academic Scholarship Foundation) and J.A.J.B. postdoctoral fellowships from the Alexander von Humboldt foundation and the Natural Sciences and Engineering Research Council of Canada.
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 94 (22) Sequence Number: 224504 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008