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

doi:10.4028/www.scientific.net/DDF.386.80

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 proceeding › Conference contribution

1 Citation (Scopus)

Abstract

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 language	English
Title of host publication	Physics and Technology of Nanostructured Materials
Editors	Nikolay G. Galkin
Publisher	Trans Tech Publications Ltd
Pages	80-85
Number of pages	6
Volume	386 DDF
ISBN (Print)	9783035714777
DOIs	https://doi.org/10.4028/www.scientific.net/DDF.386.80
Publication status	Published - 2018
Externally published	Yes
Event	4th Asian School-Conference on Physics and Technology of Nanostructured Materials, ASCO-Nanomat 2018 - Vladivostok, Russian Federation Duration: 2018 Sept 23 → 2018 Sept 28

Other

Other	4th Asian School-Conference on Physics and Technology of Nanostructured Materials, ASCO-Nanomat 2018
Country/Territory	Russian Federation
City	Vladivostok
Period	18/9/23 → 18/9/28

Keywords

Atomic-layer superconductivity
Lead
Proximity effect
Thin film

ASJC Scopus subject areas

Radiation
Materials Science(all)
Condensed Matter Physics

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10.4028/www.scientific.net/DDF.386.80

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Toyama, H., Huang, H., Nakamura, T., Bondarenko, L. V., Tupchaya, A. Y., Gruznev, D. V., Takayama, A., Zotov, A. V., Saranin, A. A., & Hasegawa, S. (2018). Superconductivity of Pb ultrathin film on Ge(111) surface. In N. G. Galkin (Ed.), Physics and Technology of Nanostructured Materials (Vol. 386 DDF, pp. 80-85). Trans Tech Publications Ltd. https://doi.org/10.4028/www.scientific.net/DDF.386.80

Toyama, H, Huang, H, Nakamura, T, Bondarenko, LV, Tupchaya, AY, Gruznev, DV, Takayama, A, Zotov, AV, Saranin, AA & Hasegawa, S 2018, Superconductivity of Pb ultrathin film on Ge(111) surface. in NG Galkin (ed.), Physics and Technology of Nanostructured Materials. vol. 386 DDF, Trans Tech Publications Ltd, pp. 80-85, 4th Asian School-Conference on Physics and Technology of Nanostructured Materials, ASCO-Nanomat 2018, Vladivostok, Russian Federation, 18/9/23. https://doi.org/10.4028/www.scientific.net/DDF.386.80

@inproceedings{1536ac4bb8eb43ea947456ae38e27cd0,

title = "Superconductivity of Pb ultrathin film on Ge(111) surface",

abstract = "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.",

keywords = "Atomic-layer superconductivity, Lead, Proximity effect, Thin film",

author = "Haruko Toyama and Hongrui Huang and Tomonori Nakamura and Bondarenko, {Leonid V.} and Tupchaya, {Alexandra Y.} and Gruznev, {Dimitry V.} and Akari Takayama and Zotov, {Andrey V.} and Saranin, {Alexander A.} and Shuji Hasegawa",

note = "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: {\textcopyright} 2018 Trans Tech Publications, Switzerland; 4th Asian School-Conference on Physics and Technology of Nanostructured Materials, ASCO-Nanomat 2018 ; Conference date: 23-09-2018 Through 28-09-2018",

year = "2018",

doi = "10.4028/www.scientific.net/DDF.386.80",

language = "English",

isbn = "9783035714777",

volume = "386 DDF",

pages = "80--85",

editor = "Galkin, {Nikolay G.}",

booktitle = "Physics and Technology of Nanostructured Materials",

publisher = "Trans Tech Publications Ltd",

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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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VL - 386 DDF

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EP - 85

BT - Physics and Technology of Nanostructured Materials

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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 -

Superconductivity of Pb ultrathin film on Ge(111) surface

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