Josephson effect in superconductive SNS heterostructures with barriers
Date
2003Source Title
Physical Review B - Condensed Matter and Materials Physics
Print ISSN
0163-1829
Publisher
The American Physical Society
Volume
67
Issue
17
Pages
174514-1 - 174514-8
Language
English
Type
ArticleItem Usage Stats
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Abstract
The dc Josephson effect in a planar superconductor-normal-metal-superconductor (SNS) junction is studied in the existence of a δ barrier in the normal region. The Green function of the structure is obtained by solving the Gorkov equations for the structure and then the current is calculated from the Green functions. The effect of the strength and position of the barrier is investigated. The current shows a weak dependence on the position of the barrier and it is seen to be maximum when the barrier is at the middle of the normal region. Also it is found that the current shows a stronger dependence on the strength of the barrier at low temperatures. A comparative discussion of three possible types of Josephson junctions, the SIS, SCS, and SNS contacts, is presented.
Keywords
MetalChemical structure
Conductance
Electric current
Low temperature
Mathematical analysis