BaFe_{1.8}Co_{0.2}As_2 thin film hybrid Josephson junctions

Abstract

Josephson junctions with iron pnictides open the way for fundamental experiments on superconductivity in these materials and their application in superconducting devices. Here, we present hybrid Josephson junctions with a BaFe_{1.8}Co_{0.2}As_2 thin film electrode, an Au barrier and a PbIn counter electrode. The junctions show RSJ-like current-voltage characteristics up to the critical temperature of the counter electrode of about 7.2K. The temperature dependence of the critical current, IC, does not show an Ambegaokar-Baratoff behavior. Well-pronounced Shapiro steps are observed at microwave frequencies of 10-18GHz. Assuming an excess current, I_ex, of 200 μA at 4.2K we get an effective I_C R_N product of 6 μV.

submitted to Appl. Phys. Lett

References in corpus (6)

• Observation of the Josephson effect in Pb/(Ba,K)Fe2As2 single crystal junctions
• Scaling behaviour of the critical current in clean epitaxial Ba(Fe1-xCox)2As2 thin films
• Theory of heterotic SIS Josephson junctions between single- and multi-gap superconductors
• DC superconducting quantum interference devices fabricated using bicrystal grain boundary junctions in Co-doped BaFe2As2 epitaxial films
• Experimental Detection of Sign-Reversal Pairing in Iron-Based Superconductors
• Josephson effect between electron-doped and hole-doped iron pnictide single crystals

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• Versatile fluoride substrates for Fe-based superconducting thin films
• Anomalous scaling behavior in a mixed-state Hall effect of a cobalt-doped BaFe2As2 epitaxial film with a high critical current density over 1 MA/cm2
• Quasiclassical description of a superconductor with a spin density wave
• Macroscopic quantum tunneling in multigap superconducting Josephson junctions: Escape rate enhancement via quantum fluctuations of Josephson-Leggett mode