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Unconventional Temperature-Dependent Critical Current in the Fe-Based Hybrid Josephson Junction with a Metallic Barrier

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Abstract

We use the multiband Fe-based superconductor (FeSC) Ba0.5K0.5Fe2As2 and the conventional superconductor Nb to fabricate a hybrid Josephson junction where an Al layer serves as a highly transparent barrier. Detailed electrical transportations are studied including the Shapiro steps and the Fraunhofer-like pattern, which indicate strong Josephson effects. An unusual temperature-dependent critical current was observed, which cannot be well described by the conventional Ambegaokar–Baratoff relation. We utilize a model considering both multiband properties in the FeSC and the conventional superconductor/normal metal/superconductor Josephson junction theory, proving that this temperature dependence on critical current is attributed to the barrier transparency of the Josephson junction. We hope our studies can be a reference for the applications or physics research of FeSC Josephson junctions.

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Acknowledgements

We gratefully acknowledge financial support from the Scientific Research Foundation for the Ph.D. (Nanjing Institute of Technology, No. YKJ2019108, YKJ2019109), Jiangsu Province Double Innovation Doctor.

Funding

This work was supported by scientific Research Foundation for the Ph.D. (Nanjing Institute of Technology, No. YKJ2019108, YKJ2019109).

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Authors and Affiliations

  1. Industrial Center/School of Innovation and Entrepreneurship, Nanjing Institute of Technology, Nanjing, China

    Huili Zhang, Duo Zhang, Weihua Shao & Wanghao Tian

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  1. Huili Zhang
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  2. Duo Zhang
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  3. Weihua Shao
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  4. Wanghao Tian
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HZ and WT wrote the main manuscript text. All authors reviewed the manuscript.

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Correspondence to Wanghao Tian.

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Zhang, H., Zhang, D., Shao, W. et al. Unconventional Temperature-Dependent Critical Current in the Fe-Based Hybrid Josephson Junction with a Metallic Barrier. J Low Temp Phys 213, 70–79 (2023). https://doi.org/10.1007/s10909-023-02984-0

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