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Atomic layer superconductivity.

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Title: Atomic layer superconductivity.
Authors: Stępniak, Agnieszka1, Leon Vanegas, Augusto1,2, Caminale, Michael1, Oka, Hirofumi1, Sander, Dirk1, Kirschner, Jürgen1,2
Source: Surface & Interface Analysis: SIA. Dec2014, Vol. 46 Issue 12/13, p1262-1267. 6p.
Subjects: Superconductivity, Scanning tunneling microscopy, Proximity effect (Superconductivity), Silicon, Lead, Silver, Spectrum analysis
Abstract: We present scanning tunneling microscopy (STM) studies of superconductivity of single layer Pb and Pb islands on Si(111). We perform temperature-dependent measurements of the differential conductance from 0.38 to 4 K in fields of up to 6 T to extract the critical temperature TC for the onset of superconductivity. We find TC = 1.5 K for a single layer Pb on Si(111), and a critical out-of-plane field of 150 mT. This deviates from bulk Pb, where TC = 7.2 K and HC = 80 mT are reported. Our results provide the temperature dependence of the superconducting gap 2 Δ. A description of this dependence in the framework of the Bardeen-Cooper-Schrieffer theory indicates an energy gap of 2 Δ0 = 0.7 meV, considerably less than the 2.7 meV found for bulk Pb. We observe that the insertion of a single layer Ag between Pb and Si suppresses superconductivity in the Pb film even at the lowest temperature of 0.38 K. Pb islands on Ag/Si(111) exhibit superconductivity. Our position-dependent STM studies from a nine-layer tall Pb island into the surrounding non-superconducting Pb wetting layer on Ag/Si(111) reveal an extension of a superconducting gap in spectroscopy up to 20 nm away from the Pb island edge at 0.38 K. © 2014 The Authors Surface and Interface Analysis Published by John Wiley & Sons Ltd. [ABSTRACT FROM AUTHOR]
Copyright of Surface & Interface Analysis: SIA is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Atomic layer superconductivity.
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  Data: <searchLink fieldCode="JN" term="%22Surface+%26+Interface+Analysis%3A+SIA%22">Surface & Interface Analysis: SIA</searchLink>. Dec2014, Vol. 46 Issue 12/13, p1262-1267. 6p.
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  Data: <searchLink fieldCode="DE" term="%22Superconductivity%22">Superconductivity</searchLink><br /><searchLink fieldCode="DE" term="%22Scanning+tunneling+microscopy%22">Scanning tunneling microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Proximity+effect+%28Superconductivity%29%22">Proximity effect (Superconductivity)</searchLink><br /><searchLink fieldCode="DE" term="%22Silicon%22">Silicon</searchLink><br /><searchLink fieldCode="DE" term="%22Lead%22">Lead</searchLink><br /><searchLink fieldCode="DE" term="%22Silver%22">Silver</searchLink><br /><searchLink fieldCode="DE" term="%22Spectrum+analysis%22">Spectrum analysis</searchLink>
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  Data: We present scanning tunneling microscopy (STM) studies of superconductivity of single layer Pb and Pb islands on Si(111). We perform temperature-dependent measurements of the differential conductance from 0.38 to 4 K in fields of up to 6 T to extract the critical temperature TC for the onset of superconductivity. We find TC = 1.5 K for a single layer Pb on Si(111), and a critical out-of-plane field of 150 mT. This deviates from bulk Pb, where TC = 7.2 K and HC = 80 mT are reported. Our results provide the temperature dependence of the superconducting gap 2 Δ. A description of this dependence in the framework of the Bardeen-Cooper-Schrieffer theory indicates an energy gap of 2 Δ0 = 0.7 meV, considerably less than the 2.7 meV found for bulk Pb. We observe that the insertion of a single layer Ag between Pb and Si suppresses superconductivity in the Pb film even at the lowest temperature of 0.38 K. Pb islands on Ag/Si(111) exhibit superconductivity. Our position-dependent STM studies from a nine-layer tall Pb island into the surrounding non-superconducting Pb wetting layer on Ag/Si(111) reveal an extension of a superconducting gap in spectroscopy up to 20 nm away from the Pb island edge at 0.38 K. © 2014 The Authors Surface and Interface Analysis Published by John Wiley & Sons Ltd. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Surface & Interface Analysis: SIA is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1002/sia.5516
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      – Code: eng
        Text: English
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        PageCount: 6
        StartPage: 1262
    Subjects:
      – SubjectFull: Superconductivity
        Type: general
      – SubjectFull: Scanning tunneling microscopy
        Type: general
      – SubjectFull: Proximity effect (Superconductivity)
        Type: general
      – SubjectFull: Silicon
        Type: general
      – SubjectFull: Lead
        Type: general
      – SubjectFull: Silver
        Type: general
      – SubjectFull: Spectrum analysis
        Type: general
    Titles:
      – TitleFull: Atomic layer superconductivity.
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            NameFull: Stępniak, Agnieszka
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            NameFull: Leon Vanegas, Augusto
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            NameFull: Caminale, Michael
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            NameFull: Oka, Hirofumi
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            NameFull: Sander, Dirk
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            – D: 01
              M: 12
              Text: Dec2014
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              Y: 2014
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              Value: 46
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              Value: 12/13
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