TY - GEN
T1 - Superconductivity of Pb ultrathin film on Ge(111) surface
AU - Toyama, Haruko
AU - Huang, Hongrui
AU - Nakamura, Tomonori
AU - Bondarenko, Leonid V.
AU - Tupchaya, Alexandra Y.
AU - Gruznev, Dimitry V.
AU - Takayama, Akari
AU - Zotov, Andrey V.
AU - Saranin, Alexander A.
AU - Hasegawa, Shuji
N1 - Funding Information:
R. Akiyama and R. Hobara are gratefully acknowledged for their useful discussion and assistance in experiments. This work was supported by the Japan Society for Promotion of Science (KAKENHI 16H02108, 25246025, and Bilateral Joint Research Project with RFBR) and Russian Foundation for Basic Research (Grant 18-52-50022).
Publisher Copyright:
© 2018 Trans Tech Publications, Switzerland
PY - 2018
Y1 - 2018
N2 - 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.
AB - 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.
KW - Atomic-layer superconductivity
KW - Lead
KW - Proximity effect
KW - Thin film
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U2 - 10.4028/www.scientific.net/DDF.386.80
DO - 10.4028/www.scientific.net/DDF.386.80
M3 - Conference contribution
AN - SCOPUS:85054789089
SN - 9783035714777
VL - 386 DDF
SP - 80
EP - 85
BT - Physics and Technology of Nanostructured Materials
A2 - Galkin, Nikolay G.
PB - Trans Tech Publications Ltd
T2 - 4th Asian School-Conference on Physics and Technology of Nanostructured Materials, ASCO-Nanomat 2018
Y2 - 23 September 2018 through 28 September 2018
ER -