Superconductivity of Pb ultrathin film on Ge(111) surface

Haruko Toyama*, Hongrui Huang, Tomonori Nakamura, Leonid V. Bondarenko, Alexandra Y. Tupchaya, Dimitry V. Gruznev, Akari Takayama, Andrey V. Zotov, Alexander A. Saranin, Shuji Hasegawa

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


We have performed structure analysis and electrical conductivity measurements of Pb ultrathin films of different thicknesses grown on Ge(111) at low temperature by using electron diffraction, scanning tunneling microscopy, and in-situ four-point probe method in ultrahigh vacuum. Three samples with different deposition amounts of Pb corresponding to 1, 3 and 10 monolayer (ML) were revealed to have different structures. The 1 ML-Pb sample, having a wetting layer and tiny clusters on it, did not show superconductivity. The 10-ML-Pb sample, consisted of continuous Pb(111) thin film structure, showed thin-film superconductivity around 6 K. The 3-ML-Pb sample, consisted of the wetting layer with unconnected Pb(111) islands on it, also showed superconductivity around 4 K. This superconductivity is thought to be induced in the wetting layer by proximity effect from superconducting Pb(111) islands. Thus, it is important to study the detailed growth structures for understanding atomic-layer superconductivity.

Original languageEnglish
Title of host publicationPhysics and Technology of Nanostructured Materials
EditorsNikolay G. Galkin
PublisherTrans Tech Publications Ltd
Number of pages6
Volume386 DDF
ISBN (Print)9783035714777
Publication statusPublished - 2018
Externally publishedYes
Event4th Asian School-Conference on Physics and Technology of Nanostructured Materials, ASCO-Nanomat 2018 - Vladivostok, Russian Federation
Duration: 2018 Sept 232018 Sept 28


Other4th Asian School-Conference on Physics and Technology of Nanostructured Materials, ASCO-Nanomat 2018
Country/TerritoryRussian Federation


  • Atomic-layer superconductivity
  • Lead
  • Proximity effect
  • Thin film

ASJC Scopus subject areas

  • Radiation
  • General Materials Science
  • Condensed Matter Physics


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