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Title: Scanning tunneling microscopy study of the superconducting properties of three-atomic-layer Pb films

Ultrathin Pb films with a thickness of three monolayers (ML) were prepared on α-√(3)×√(3)Pb/Si(111) (Pb-SIC) substrate by molecular beam epitaxy. Despite significant defect scattering, low temperature scanning tunneling microscopy reveals a high superconducting transition temperature T{sub c} of 6.9 K, compared with the bulk T{sub c} (7.2 K). By applying external magnetic field, magnetic vortices were directly imaged, which demonstrates the robustness of superconductivity. By comparing to nearly free-standing Pb films on graphitized SiC (0001) substrate, we suggest that the higher T{sub c} of 3 ML Pb films on Pb-SIC originates from the combined effects of quantum confinement and substrate-enhanced electron-phonon coupling.
Authors:
; ; ; ;  [1] ;  [1] ;  [2] ;  [3]
  1. State Key Laboratory for Surface Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China)
  2. (China)
  3. State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084 (China)
Publication Date:
OSTI Identifier:
22253781
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 24; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ELECTRON-PHONON COUPLING; FILMS; LAYERS; MAGNETIC FIELDS; MAGNETIC FLUX; MOLECULAR BEAM EPITAXY; SCANNING TUNNELING MICROSCOPY; SILICON CARBIDES; SUBSTRATES; SUPERCONDUCTIVITY; THICKNESS; TRANSITION TEMPERATURE