한국초전도ㆍ저온공학회논문지 (Progress in Superconductivity and Cryogenics)

  • 제24권4호
  • /
  • Pages.6-10
  • /
  • 2022
  • /
  • 1229-3008(pISSN)
  • /
  • 2287-6251(eISSN)
한국초전도저온학회 (The Korean Society of Superconductivity and Cryogenics)
권호 표지
DOI QR코드

DOI QR Code

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))
  • 투고 : 2022.12.13
  • 심사 : 2022.12.29
  • 발행 : 2022.12.31
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

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.

키워드

과제정보

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

참고문헌

  1. B. D. Josephson, "Possible new effects in superconductive tunnelling," Physics letters, vol. 1, pp. 251-253. 1962.  https://doi.org/10.1016/0031-9163(62)91369-0
  2. F. Tafuri, "Introduction: the Josephson Effect and Its Role in Physics," pp. 61581-1586, 2021. 
  3. K. Likharev, "Superconducting weak links," Reviews of Modern Physics, vol. 51, pp. 101, 1979.  https://doi.org/10.1103/RevModPhys.51.101
  4. V. Ryazanov, et al., "Coupling of two superconductors through a ferromagnet: Evidence for a π junction," Physical review letters, vol. 86, pp. 2427, 2001.  https://doi.org/10.1103/physrevlett.86.2427
  5. T. Akazaki, et al., "A Josephson field effect transistor using an InAs-inserted-channel In0.52Al0.48As/In0.53Ga0.47As inverted modulation-doped structure," Applied physics letters, vol. 68, pp. 418-420, 1996.  https://doi.org/10.1063/1.116704
  6. Y. -J. Doh, et al., "Tunable supercurrent through semiconductor nanowires," science, vol. 309, pp. 272-275, 2005.  https://doi.org/10.1126/science.1113523
  7. B. -K. Kim, et al., "Strong superconducting proximity effects in PbS semiconductor nanowires," ACS nano, vol. 11, pp. 221-226, 2017.  https://doi.org/10.1021/acsnano.6b04774
  8. J. Kim, et al., "Macroscopic quantum tunneling in superconducting junctions of β-Ag2Se topological insulator nanowire," Nano letters, vol. 17, pp. 6997-7002, 2017.  https://doi.org/10.1021/acs.nanolett.7b03571
  9. N. -H. Kim, et al., "Zero bias conductance peak in InAs nanowire coupled to superconducting electrodes," Current Applied Physics, vol. 18, pp. 384-387, 2018.   https://doi.org/10.1016/j.cap.2018.01.016
  10. R. -H. Kim, et al., "Multiple andreev reflections in topological insulator nanoribbons," Current Applied Physics, vol. 34, pp. 107-111, 2022.  https://doi.org/10.1016/j.cap.2021.12.003
  11. D. Jeong, et al., "Observation of supercurrent in PbIn-graphene-PbIn Josephson junction," Physical Review B, vol. 83, pp. 094503, 2011.  https://doi.org/10.1103/physrevb.83.094503
  12. G. -H. Lee, et al., "Electrically tunable macroscopic quantum tunneling in a graphene-based Josephson junction," Physical review letters, vol. 107, pp. 146605, 2011.  https://doi.org/10.1103/physrevlett.107.146605
  13. M. Tinkham, Introduction to superconductivity, Dover publications, New York, USA, 2004. 
  14. M. Jung, et al., "Superconducting junction of a single-crystalline Au nanowire for an ideal Josephson device," ACS nano, vol. 5, pp. 2271-2276, 2011.  https://doi.org/10.1021/nn1035679
  15. N. -H. Kim, et al., "Fabrication and characterization of PbIn-Au-PbIn superconducting junctions," Progress in superconductivity and cryogenics, vol. 18, 2016. 
  16. B. Kim, et al., "Fabrication and characterization of superconducting coplanar waveguide resonators," Progress in Superconductivity and Cryogenics, vol. 22, pp. 10-13, 2020.  https://doi.org/10.9714/PSAC.2020.22.4.010
  17. J. Kim, et al., "Proximity effect in Nb/Au/Co Fe trilayers," Physical Review B, vol. 71, pp. 214519, 2005.  https://doi.org/10.1103/physrevb.71.214519
  18. P. Dubos, et al., "Josephson critical current in a long mesoscopic S-N-S junction," Physical Review B, vol. 63, pp. 064502, 2001.  https://doi.org/10.1103/PhysRevB.63.064502
  19. F. Bergeret, et al.,"The vortex state and Josephson critical current of a diffusive SNS junction" Journal of Low Temperature Physics, Vol. 153, pp. 304-324. 2008.  https://doi.org/10.1007/s10909-008-9826-2
  20. D. J. Thoen, et al.,"Superconducting NbTin Thin Films With Highly Uniform Properties Over a ∅ 100 mm Wafer" IEEE Transactions on Applied Superconductivity, Vol. 27, pp. 1-5. 2017.