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arXiv · 1007.5252

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

S. Schmidt·S. Döring·F. Schmidl·V. Grosse·P. Seidel·K. Iida·F. Kurth·S. Haindl·I. Mönch·B. Holzapfel
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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.

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S. Schmidt, S. Döring, F. Schmidl, V. Grosse, P. Seidel, K. Iida, F. Kurth, S. Haindl, I. Mönch, B. Holzapfel. 2010-09-01. BaFe_{1.8}Co_{0.2}As_2 thin film hybrid Josephson junctions. https://doi.org/10.1063/1.3505526

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