Josephson effect between electron-doped and hole-doped iron pnictide single crystals

Abstract

We have observed the Josephson effect in junctions formed between single crystals of SrFe1.74Co0.26As2 and Ba0.23K0.77Fe2As2. I-V curves showed resistively-shunted junction characteristics, and the ac Josephson effect was observed under microwave irradiation. By applying an in-plane magnetic field, the critical current is completely modulated and shows a relatively symmetric diffraction pattern, consistent with the intermediate junction limit. The observation of the Josephson effect in the p-n bicrystal structure not only has significant implications for designing phase-sensitive junctions to probe the pairing symmetry of iron pnictide superconductors, but also represents an important step in developing all iron pnictide devices for applications.

12 pages, 3 figures. accepted for publication in Appl. Phys. Lett

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Cited by in corpus (15)

• Template engineering of Co-doped BaFe2As2 single-crystal thin films
• Josephson junction in cobalt-doped BaFe2As2 epitaxial thin films on (La, Sr)(Al, Ta)O3 bicrystal substrates
• Thin Film Growth and Device Fabrication of Iron-Based Superconductors
• BaFe_{1.8}Co_{0.2}As_2 thin film hybrid Josephson junctions
• Ambegaokar-Baratoff relations of Josephson critical current in heterojunctions with multi-gap superconductors
• Universal pair-breaking in transition metal-substituted iron-pnictide superconductors
• C-axis critical current of a PrFeAsO0.7 single crystal
• Evidence of a universal and isotropic 2Δ/kBTC ratio in 122-type iron pnictide superconductors over a wide doping range
• Shapiro Steps as a Direct Probe of $\pm s$-wave Symmetry in Multi-gap Superconducting Josephson Junctions
• Investigation of TiO${}_x$ barriers for their use in hybrid Josephson and tunnelling junctions based on Ba-122 thin films
• Probing the Order Parameter of Superconducting LiFeAs using Pb/LiFeAs and Au/LiFeAs Point-Contact Spectroscopy
• Josephson effect and Andreev reflection in Ba(1-x)NaxFe2As2 (x=0.25 and 0.35) point contacts
• Spatial BCS-BEC crossover in superconducting p-n junctions
• The Critical Current of Point Symmetric Josephson Tunnel Junctions
• Absence of Josephson coupling between certain superconductors