Two-dimensional array of diffusive SNS junctions with high-transparent interfaces

Abstract

We report the first comparative study of the properties of two-dimensional arrays and single superconducting film - normal wire - superconducting film (SNS) junctions. The NS interfaces of our SNS junctions are really high transparent, for superconducting and normal metal parts are made from the same material (superconducting polycrystalline PtSi film). We have found that the two-dimensional arrays reveal some novel features: (i) the significant narrowing of the zero bias anomaly (ZBA) in comparison with single SNS junctions, (ii) the appearance of subharmonic energy gap structure (SGS), with up to n=16 (eV=\pm 2Δ/n), with some numbers being lost, (iii) the transition from 2D logarithmic weak localization behavior to metallic one. Our experiments show that coherent phenomena governed by the Andreev reflection are not only maintained over the macroscopic scale but manifest novel pronounced effects as well. The behavior of the ZBA and SGS in 2D array of SNS junctions strongly suggests that the development of a novel theoretical approach is needed which would self-consistently take into account the distribution of the currents, the potentials, and the superconducting order parameter.

RevTex, 5 pages, 5 figures

References in corpus (3)

• Long-Range Coherence in a Mesoscopic Metal near a Superconducting Interface
• Andreev Reflection Enhanced Shot Noise in Mesoscopic SNS Junctions
• Nonlinear $\sigma$ model for disordered superconductors

Cited by in corpus (8)

• Stimulation of the fluctuation superconductivity by the PT-symmetry
• Direct visualization of phase separation between superconducting and nematic domains in Co-doped CaFe2As2 close to a first order phase transition
• Anomalous Behavior near T_c and Synchronization of Andreev Reflection in Two-Dimensional Arrays of SNS Junctions
• Subgap anomaly and above-energy-gap structure in chains of diffusive SNS junctions
• Synchronized Andreev Transmission in SNS Junction Arrays
• Nonequilibrium mesoscopic superconductors in a fluctuational regime
• Fate of global superconductivity in arrays of long SNS junctions
• Synchronized Andreev Transmission in Chains of SNS Junctions