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

Teet Örd (), Küllike Rägo, Artjom Vargunin and Grzegorz Litak
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Teet Örd: Institute of Physics, University of Tartu
Küllike Rägo: Institute of Physics, University of Tartu
Artjom Vargunin: Institute of Physics, University of Tartu
Grzegorz Litak: Lublin University of Technology, Faculty of Mechanical Engineering

The European Physical Journal B: Condensed Matter and Complex Systems, 2018, vol. 91, issue 1, 1-6

Abstract: 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.

Keywords: Solid; State; and; Materials (search for similar items in EconPapers)
Date: 2018
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DOI: 10.1140/epjb/e2017-80477-8

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