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


研究成果: Conference contribution

1 被引用数 (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.

ホスト出版物のタイトルPhysics and Technology of Nanostructured Materials
編集者Nikolay G. Galkin
出版社Trans Tech Publications Ltd
386 DDF
出版ステータスPublished - 2018
イベント4th Asian School-Conference on Physics and Technology of Nanostructured Materials, ASCO-Nanomat 2018 - Vladivostok, Russian Federation
継続期間: 2018 9月 232018 9月 28


Other4th Asian School-Conference on Physics and Technology of Nanostructured Materials, ASCO-Nanomat 2018
国/地域Russian Federation

ASJC Scopus subject areas

  • 放射線
  • 材料科学(全般)
  • 凝縮系物理学


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