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

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

2010-07-29

arxiv.org/abs/1007.5252v2

Appl. Phys. Lett. 97, 172504 (2010)

Physics

Condensed Matter

Superconductivity

submitted to Appl. Phys. Lett

Scientific paper

10.1063/1.3505526

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 {\mu}A at 4.2K we get an effective I_C R_N product of 6 {\mu}V.

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