Proximity Effect Enhancement Induced by Roughness of SN Interface

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Critical temperature reduction ΔTc is considered for a thin film of a layered superconductor (S) with a rough surface covered by a thick layer of a normal metal (N). The roughness of the SN interface increases the penetration of electrons from the normal metal into the superconductor and leads to an enhancement of the proximity effect. The value of ΔTc induced by the roughness of the SN interface can be much higher than ΔTc for a film with a plain surface for an extremely anisotropic layered superconductor with the coherence lengths ξₐ,ξb≫ξc.