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Exact calculations of the current-voltage curves for N-I-S and S'-I-S junctions with comparison to experimental data

✍ Scribed by R. Hoonsawat; M. Siribangphae

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
581 KB
Volume
194
Category
Article
ISSN
0921-4534

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✦ Synopsis

The transmission coefficients for the NIS and S' IS sandwich junctions are calculated using the independent electron model approach. The calculated coefficients in both cases are found to be related to the BCS density of states. Since these coefficients appear in the integral expression for the net tunneling current, the tunneling currents tbr both junctions are also related to these densities of states. The integrals are evaluated numerically to yield a "calculated" net electric current for the two types of junctions. The "calculated" current-voltage curves are in very good agreement with experimental results for junctions containing either conventional superconductors or high-To superconductors. The only adjustments needed for the curve fitting are the values of the wave vector within the insulator layer in the junction.

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