Proximity-induced superconductivity in nanowires: Mini-gap state and differential magnetoresistance oscillations

Abstract

We study proximity-induced superconductivity in gold nanowires as a function of the length of the nanowire, magnetic field, and excitation current. Short nanowires exhibit a sharp superconducting transition, whereas long nanowires show nonzero resistance. At intermediate lengths, however, we observe two sharp transitions; the normal and superconducting regions are separated by what we call the mini-gap phase. Additionally, we detect periodic oscillations in the differential magnetoresistance. We provide a theoretical model for the mini-gap phase as well as the periodic oscillations in terms of the coexistence of proximity-induced superconductivity with a normal region near the center of the wire, created either by temperature or application of a magnetic field.

arXiv comment11 pages, 4 figures

References in corpus (20)

• Odd Triplet Superconductivity and Related Phenomena in Superconductor-Ferromagnet Structures
• Bipolar supercurrent in graphene
• Quantum suppression of superconductivity in ultrathin nanowires
• Tunable Supercurrent Through Semiconductor Nanowires
• Superconductivity in one dimension
• Ge/Si nanowire mesoscopic Josephson junctions
• Phase controlled superconducting proximity effect probed by tunneling spectroscopy
• Size Dependent Breakdown of Superconductivity in Ultranarrow Nanowires
• Focused-ion-beam-induced deposition of superconducting nanowires
• Evidence for Macroscopic Quantum Tunneling of Phase Slips in Long One-Dimensional Superconducting Al Wires
• Suppression of superconductivity in nanowires by bulk superconductors
• Multiple Andreev Reflection and Giant Excess Noise in Diffusive Superconductor/Normal-Metal/Superconductor Junctions
• Nanowire Acting as a Superconducting Quantum Interference Device
• Coherent low-energy charge transport in a diffusive S-N-S junction
• Andreev Current-Induced Dissipation in a Hybrid Superconducting Tunnel Junction
• Anomalous Proximity Effect in Underdoped YBaCuO Josephson Junctions
• Geometrical enhancement of the proximity effect in quantum wires with extended superconducting tunnel contacts
• Spatially resolved spectroscopy on a superconducting proximity structure
• Unusual giant magnetoresistance effect in heterojunction structure of ultra-thin single-crystal Pb film on silicon substrate
• Divergence at low bias and down-mixing of the current noise in a diffusive superconductor-normal metal-superconductor junction

Cited by in corpus (17)

• Visualizing landscapes of the superconducting gap in heterogeneous superconductor thin films: geometric influences on proximity effects
• Josephson Field-Effect Transistors Based on All-Metallic Al/Cu/Al Proximity Nanojunctions
• Phases and phase transitions in two dimensional superconducting films
• Interplay between topological insulators and superconductors
• Geometry-related magnetic interference patterns in long SNS Josephson junctions
• Proximity-induced supercurrent through topological insulator based nanowires for quantum computation studies
• Superconductivity in single crystalline Pb nanowires contacted by normal metal electrodes
• Electronic transport properties of topological insulator films and low dimensional superconductors
• Anti-proximity Effect in Aluminum Nanowires
• Two-band superconductivity of bulk and surface states in Ag thin films on Nb
• Niobium-based superconducting nano-devices fabrication using all-metal suspended masks
• Impurity effect and suppression to superconductivity in Na(Fe${}_{0.97-x}$Co${}_{0.03}$T${}_x$)As (T=Cu, Mn)
• Nonequilibrium noise and current fluctuations at the superconducting phase transition
• Superconducting Vortices induced Periodic Magnetoresistance Oscillations in Single Crystal Au Nanowires
• Long-Range Superconducting Proximity Effect in Nickel Nanowires
• Anomalous superconducting proximity effect of planar Pb-RhPb2 heterojunctions in the clean limit
• Novel voltage signal at proximity effect induced superconducting transition temperature in gold nanowires