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

References in corpus (5)

• Magnetism, superconductivity, and pairing symmetry in Fe-based superconductors
• Multiband magnetism and superconductivity in Fe-based compounds
• Probing superconducting energy gap from infrared spectroscopy on a Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$ single crystal with T${}_c$=37 K
• Observation of the Josephson effect in Pb/(Ba,K)Fe2As2 single crystal junctions
• Evolution of bulk superconductivity in SrFe2As2 with Ni substitution