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Strong temperature effect on the sizes of the Cooper pairs in a two-band superconductor

Author

Listed:
  • Teet Örd

    (Institute of Physics, University of Tartu)

  • Küllike Rägo

    (Institute of Physics, University of Tartu)

  • Artjom Vargunin

    (Institute of Physics, University of Tartu
    The Royal Institute of Technology)

  • Grzegorz Litak

    (Lublin University of Technology, Faculty of Mechanical Engineering
    AGH University of Science and Technology, Department of Process Control)

Abstract

We study the temperature dependencies of the mean sizes of the Cooper pairs in a two-band BCS-type s-wave superconductivity model with coupling cut-off in the momentum space. It is found that, in contrast to single-band systems, the size of Cooper pairs in the weaker superconductivity band can significantly decrease with a temperature increase due to an interband proximity effect. The relevant spatial behaviour of the wave functions of the Cooper pairs is analyzed. The results also indicate a possibility that the size of Cooper pairs in two-band systems may increase with an increase in temperature.

Suggested Citation

  • Teet Örd & Küllike Rägo & Artjom Vargunin & Grzegorz Litak, 2018. "Strong temperature effect on the sizes of the Cooper pairs in a two-band superconductor," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 91(1), pages 1-6, January.
    • Handle: RePEc:spr:eurphb:v:91:y:2018:i:1:d:10.1140_epjb_e2017-80477-8
    DOI: 10.1140/epjb/e2017-80477-8
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    Keywords

    Solid State and Materials;

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