Effect of phonons on the Josephson current density in superconductor–normal-metal–superconductor junctions with a strong-coupling normal layer
W. Lee
DOI 10.1103/PhysRevB.50.3977 · Physical Review B
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Abstract
We consider SNS junctions with a strong-coupling normal layer N, and calculate the Josephson critical current density Jc as a function of the electron-phonon coupling properties of the N layer. It is shown quantitatively that Jc drops quickly as the coupling strength increases and that in thick junctions with the thickness 2b≳2π(ΔS/ħωph)ξS, the falling rate depends only on the coupling constant λ regardless of the spectrum of α2F(ω).
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