Planar hybrid superconductor-normal metal-superconductor thin film junctions based on BaFe1.8Co0.2As2

Abstract

To investigate the transport properties of iron based superconductors, we prepared planar hybrid superconductor-normal metal-superconductor (SNS') thin film junctions with BaFe1.8Co0.2As2 as base electrode. As counter electrode we used a lead indium alloy, while the normal metal layer was formed by thin gold films. Temperature dependent measurements of the electrical conductivity were strongly influenced by the properties of the electrodes. We developed a junction structure that allows us to characterize the electrodes, too, including the behavior of their normal state resistance in order to correct their influences on the conduction spectra. The corrected conductivity of the junction was described within an extended BTK-model and shows a behavior dominated by Andreev reflexion.

9 pages, 6 figures

References in corpus (15)

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• Measurement of a Sign-Changing Two-Gap Superconducting Phase in Electron-Doped Ba(Fe_{1-x}Co_x)_2As_2 Single Crystals using Scanning Tunneling Spectroscopy
• BaFe_{1.8}Co_{0.2}As_2 thin film hybrid Josephson junctions
• Point-contact spectroscopic studies on normal and superconducting AFe_2As_2-type iron-pnictide single crystals
• Evidence of a universal and isotropic 2Δ/kBTC ratio in 122-type iron pnictide superconductors over a wide doping range
• Pseudogap-less high T${}_c$ superconductivity in BaCo${}_x$Fe${}_{2-x}$As${}_2$

Cited by in corpus (6)

• Thin Film Growth and Device Fabrication of Iron-Based Superconductors
• Proximity and Josephson effects in microstructures based on multiband superconductors
• Investigation of TiO${}_x$ barriers for their use in hybrid Josephson and tunnelling junctions based on Ba-122 thin films
• Preparation of hybrid Josephson junctions on Co-doped Ba-122 single crystals
• Influence of the spreading resistance on the conductance spectrum of planar hybrid thin film SNS' junctions based on iron pnictides
• A model for critical current effects in point-contact Andreev-reflection spectroscopy