Characterizing the Josephson Effect on Ba-122 Single-Crystal Junctions

Abstract

This paper presents c-direction hybrid Josephson junctions with base electrodes of Co:BaFe2As2 single crystals. To realize Josephson junctions, it applies standard photolithography technologies and a newly developed surface polishing method that was used. As conventional isotropic s-wave superconductor counter electrodes used double layers of Pb/In. The artificial barrier for the tunneling junctions consists of a thin sputtered Ti layer or a thermally evaporated Al layer; both layers were used as an insulator barrier. For characterizing the Josephson effects with TiOx barrier, we could realize IcRN products of about 13.7 μV and unconventional Ic-T dependencies. The formation of Shapiro steps under the influence of microwave irradiation and magnetic field to the junctions will be discussed as well.

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Acknowledgments

The authors thank Dr. S. Döring for his useful comments.

Funding

This paper is financially supported by the EU under project no. FP7-283141 (IRON-SEA), DFG under project no. SE 664/15-2, the Landesgraduiertenförderung Thüringen, Institute of Physics IOP, and the German Academic Exchange Service (DAAD).

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Correspondence to N. Hasan.

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Hasan, N., Reifert, D., Schmidt, S. et al. Characterizing the Josephson Effect on Ba-122 Single-Crystal Junctions. J Supercond Nov Magn 32, 2727–2732 (2019). https://doi.org/10.1007/s10948-019-5033-4

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Keywords

  • Iron pnictide
  • Josephson junctions
  • Single crystals