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Proximity Effect and Josephson Current in Superconducting Sandwich Systems near Transition Temperature
Author(s) -
Knauer H.,
Richter J.,
Seidel P.
Publication year - 1979
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.19794910305
Subject(s) - supercurrent , extrapolation , superconductivity , condensed matter physics , josephson effect , physics , transition temperature , impurity , superconducting transition temperature , insulator (electricity) , proximity effect (electron beam lithography) , materials science , quantum mechanics , nanotechnology , mathematics , mathematical analysis , optoelectronics , layer (electronics) , resist , electron beam lithography
Abstract Near the superconducting transition temperature pairpotential behaviour and supercurrent in nonhomogeneous sandwich systems of SNS‐and SINIS‐types (S superconductor, N normal metal, I insulator) are theoretically investigated. The proximity effect is taken into account by using an extrapolation length which relates the order parameter value to its first derivative at interfaces. In frame of the microscopic theory of superconductivity this extrapolation length follows with the help of an appropriate variational principle which has been checked on systems which allow exact solutions. The resulting supercurrent expressions are discussed in detail with respect to temperature dependence and impurity influence.