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Theoretical Investigation of the Critical Josephson Current of Niobium‐Lead Tunnel Junctions
Author(s) -
Seidel P.,
Richter J.
Publication year - 1980
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220990220
Subject(s) - niobium , josephson effect , current (fluid) , condensed matter physics , lead (geology) , superconductivity , critical current , materials science , pi josephson junction , proximity effect (electron beam lithography) , josephson energy , physics , engineering physics , nanotechnology , geology , metallurgy , thermodynamics , layer (electronics) , geomorphology , resist , electron beam lithography
Abstract In order to calculate the critical Josephson current I c of niobium‐lead tunnel junctions the proximity‐effect model previously presented by the authors is used to describe the niobium electrodes. The resulting I c .‐dependence on temperature differs from the commonly used Ambegaokar‐Baratoff result in accordance with many experimental observations. The theoretical model allows to explain these differences and offers good possibilities to describe the experiments.