Multiple Andreev scattering in superconductor–normal metal–superconductor junctions as a test for anisotropic electron pairing

T. P. Devereaux; P. Fulde

doi:10.1103/PhysRevB.47.14638

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Multiple Andreev scattering in superconductor–normal metal–superconductor junctions as a test for anisotropic electron pairing

T. P. Devereaux, P. Fulde

DOI 10.1103/PhysRevB.47.14638 · Physical Review B

T1

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Abstract

Current-voltage characteristics of superconductor–normal metal–superconductor junctions due to multiple Andreev reflections at the interfaces are investigated for anisotropic superconductors. Using nonequilibrium time-dependent Bogoliubov–de Gennes equations, it is shown that the presence of gap nodes perpendicular to the interface greatly smear subharmonic gap structures corresponding to voltages V≤2Δ(k^)/en for n=1,2,3,. . . for n Andreev reflections as seen in s-wave superconductors, while the overall current due to Andreev reflections is reduced. Further, asymmetric line shapes for dI/dV are predicted. It is suggested that these features could be used to distinguish between superconductors with or without nodes.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown