Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Fabrication and characterization of NbTi-Au-NbTi Josephson junctions

  • Pyeong Kang, Kim (Department of Physics and Photon Science, Gwangju Institute of Science and Technology (GIST)) ;
  • Heechan, Bang (Department of Physics and Photon Science, Gwangju Institute of Science and Technology (GIST)) ;
  • Bongkeon, Kim (Department of Physics and Photon Science, Gwangju Institute of Science and Technology (GIST)) ;
  • Yong-Joo, Doh (Department of Physics and Photon Science, Gwangju Institute of Science and Technology (GIST))
  • Received : 2022.12.13
  • Accepted : 2022.12.29
  • Published : 2022.12.31
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Abstract

We report on the fabrication and measurements of metallic Josephson junctions (JJs) consisting of Au nanoribbon and NbTi superconducting electrodes. The maximum supercurrent density in the junction reaches up to ~ 3×105 A/cm2 at 2.5 K, much larger than that of JJ using single-crystalline Au nanowire. Temperature dependence of the critical current exhibits an exponential decay behavior with increasing temperature, which is consistent with a long and diffusive junction limit. Under the application of a magnetic field, monotonous decrease of the critical current was observed due to a narrow width of the Au nanoribbon. Our observatons suggest that NbTi/Au/NbTi JJ would be a useful platform to develop an integrated superconducing quantum circuit combined with the superconducting coplanar waveguide and ferromagnetic π junctions.

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Acknowledgement

This work was supported by the NRF of Korea through the research program (2018R1A3B1052827) and GRI grant funded by the GIST in 2022.

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