Proximity effects and Andreev reflection in mesoscopic SNS junction with perfect NS interfaces

Abstract

Low temperature transport measurements on superconducting film - normal metal wire - superconducting film (SNS) junctions fabricated on the basis of 6 nm thick superconducting polycrystalline PtSi films are reported. The structures with the normal metal wires of two different lengths L=1.5 $\mu$m and L=6$\mu$m and the same widths W=0.3$\mu$m are studied. Zero bias resistance dip related to pair current proximity effect is observed for all junctions whereas the subharmonic energy gap structure originating from phase coherent multiple Andreev reflections have occurs only in the SNS junctions with short wires.

ReVTex, 4 pages, 4 eps figures included

Cited by in corpus (8)

• Stimulation of the fluctuation superconductivity by the PT-symmetry
• Enhancement of Superconductivity in Disordered Films by Parallel Magnetic Field
• Andreev reflection at the edge of a two-dimentional semimetal
• The origin of bias independent conductance plateaus and zero bias conductance peaks in Bi2Se3/NbSe2 hybrid structures
• Subgap anomaly and above-energy-gap structure in chains of diffusive SNS junctions
• Synchronized Andreev Transmission in SNS Junction Arrays
• Tail States below the Thouless Gap in SNS junctions: Classical Fluctuations
• Synchronized Andreev Transmission in Chains of SNS Junctions