Fluctuation spectroscopy of granularity in superconducting structures

Abstract

We suggest to use `fluctuation spectroscopy' as a method to detect granularity in a disordered metal close to a superconducting transition. We show that with lowering temperature $T$ the resistance $R(T)$ of a system of relatively large grains initially grows due to the fluctuation suppression of the one-electron tunneling but decreases with further lowering $T$ due to the coherent charge transfer of the fluctuation Cooper pairs. Under certain conditions, such a maximum in $R(T)$ turns out to be sensitive to weak magnetic fields due to a novel Maki -- Thompson type mechanism.

A final version, as published; the introduction and summary are considerably revised

References in corpus (8)

• Granular Electronic Systems
• Localized Superconductivity in the Quantum-Critical Region of the Disorder-Driven Superconductor-Insulator Transition in TiN Thin Films
• Transport properties of granular metals at low temperatures
• Negative Magnetoresistance of Granular Metals in a Strong Magnetic Field
• Magnetoresistance of Granular Superconducting Metals in a Strong Magnetic Field
• Weak Localization in Metallic Granular Media
• Weak localization effects in granular metals
• Superconducting Fluctuations in Granular Metals with a Large Coupling Between the Grains

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• Quantum Fluctuations and Dynamic Clustering of Fluctuating Cooper Pairs
• Fluctuation spectroscopy as a probe of granular superconducting diamond films
• Transport theory of superconductors with singular interaction corrections
• Interaction corrections to tunneling conductance in ballistic superconductors
• Effect of the Anomalous Diffusion of Fluctuating Cooper Pairs in the Density of States of Superconducting NbN Thin Films
• Anomalous mesoscopic kinetics in disordered superconductors
• Transport anomalies in multiband superconductors near quantum critical point
• Fluctuation Spectroscopy in Granular Superconductors with Application to Boron-doped Nanocrystalline Diamond
• Fluctuational susceptibility of ultracold bosons in the vicinity of condensation
• Microwave Signature of the Emerging Abrikosov Lattice Above $H_{c2}$