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Strong temperature effect on the sizes of the Cooper pairs in a two-band superconductor
Univ Tartu, Inst Phys, W Ostwaldi Str 1, EE-50411 Tartu, Estonia..ORCID iD: 0000-0003-3936-9094
Univ Tartu, Inst Phys, W Ostwaldi Str 1, EE-50411 Tartu, Estonia..
KTH, School of Engineering Sciences (SCI), Theoretical Physics. Univ Tartu, Inst Phys, W Ostwaldi Str 1, EE-50411 Tartu, Estonia.
Lublin Univ Technol, Fac Mech Engn, Nadbystrzycka 36, PL-20618 Lublin, Poland.;AGH Univ Sci & Technol, Dept Proc Control, Mickiewicza 30, PL-30059 Krakow, Poland..ORCID iD: 0000-0002-9647-8345
2018 (English)In: European Physical Journal B: Condensed Matter Physics, ISSN 1434-6028, E-ISSN 1434-6036, Vol. 91, no 1, article id 2Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Springer, 2018. Vol. 91, no 1, article id 2
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Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-240187DOI: 10.1140/epjb/e2017-80477-8ISI: 000423448000002Scopus ID: 2-s2.0-85045293329OAI: oai:DiVA.org:kth-240187DiVA, id: diva2:1270855
Note

QC 20181214

Available from: 2018-12-14 Created: 2018-12-14 Last updated: 2018-12-14Bibliographically approved

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