DOI QR코드

DOI QR Code

Characterizing Pb-based superconducting thin films

  • Park, Sang-Il (Department of Applied Physics, Korea University Sejong Campus) ;
  • Kim, Hong-Seok (Department of Applied Physics, Korea University Sejong Campus) ;
  • Lee, Joon Sung (Department of Applied Physics, Korea University Sejong Campus) ;
  • Doh, Yong-Joo (Department of Applied Physics, Korea University Sejong Campus)
  • Received : 2014.12.09
  • Accepted : 2014.12.20
  • Published : 2014.12.31

Abstract

We report on the superconducting and structural characteristics of Pb-based alloy ($Pb_{0.9}In_{0.1}$, $Pb_{0.8}In_{0.2}$ and $Pb_{0.85}Bi_{0.15}$) thin films, depending on the film deposition rate. The maximum critical magnetic field strength of $Pb_{0.85}Bi_{0.15}$ is almost six times larger than that of $Pb_{0.9}In_{0.1}$, and more rapid growth of the film enhances the critical magnetic field strength even for the same alloy material. Scanning electron microscopy inspection indicates that lower deposition rate condition is vulnerable to the formation of void structure in the film. Topographic images using atomic force microscopy are useful to optimize the deposition condition for the growth of smooth superconducting film. Our work can be utilized for future studies on hybrid superconducting devices using low-dimensional nanostructures.

Keywords

References

  1. Y.-J. Doh et al., "Tunable supercurrent through semiconductor nanowires," Science, vol. 309, pp. 272-275, 2005. https://doi.org/10.1126/science.1113523
  2. P. Jarillo-Herrero, J. A. van Dam, and L. P. Kouwenhoven, "Quantum supercurrent transistors in carbon nanotubes," Nature, vol. 439, pp. 953-956, 2006. https://doi.org/10.1038/nature04550
  3. H. B. Heersche, P. Jarillo-Herrero, J. B. Oostinga, L. M. K. Vandersypen, and A. F. Morpurgo, "Bipolar supercurrent in graphene," Nature, vol. 446, pp. 56-59, 2007. https://doi.org/10.1038/nature05555
  4. M. Veldhorst et al., "Josephson supercurrent through a topological insulator surface state, Nature Materials, vol. 11, pp. 417-421, 2012. https://doi.org/10.1038/nmat3255
  5. M. Tikkham, "Introduction to superconductivity," McGraw-Hill, Singapore, ed.2, 1996.
  6. V. Mourik et al., "Signatures of Majorana fermions in hybrid superconductor-semiconductor nanowire devices," Science, vol. 336, pp. 1003-1007, 2012. https://doi.org/10.1126/science.1222360
  7. A. Das et al., "Zero-bias peaks and splitting in an Al-InAs nanowire topological superconductor as a signature of Majorana fermions," Nature Physics, vol. 8, pp. 887-895, 2012. https://doi.org/10.1038/nphys2479
  8. S. R. Foltyn et al., "Influence of deposition rate on the properties of thick YBa2Cu3O7-d films," Journal of Materials Research, vol. 12, pp. 2941-2946 (1997). https://doi.org/10.1557/JMR.1997.0388

Cited by

  1. Gate-tunable superconducting quantum interference devices of PbS nanowires vol.9, pp.2, 2016, https://doi.org/10.7567/APEX.9.023102
  2. Zero bias conductance peak in InAs nanowire coupled to superconducting electrodes 2018, https://doi.org/10.1016/j.cap.2018.01.016