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Unusual boundary effect on coherency in two-band superconductors
KTH, School of Engineering Sciences (SCI), Theoretical Physics. University of Tartu, Estonia.
2017 (English)In: Physics Letters A, ISSN 0375-9601, E-ISSN 1873-2429, Vol. 381, no 37, 3241-3245 p.Article in journal (Refereed) Published
Abstract [en]

We demonstrate that restoration of two-band superconductivity near the surface of the system is governed by length scales which are drastically different from correlation lengths. Similar to the one band case, one of the characteristic lengths diverges at critical temperature T-c, while another one shows unusual behaviour having singularity at Tc+ < T-c. By moving away from the boundary, these scales approach correlation lengths in the bulk state, where the divergence at Tc+ is removed by arbitrary weak interband coupling. The peculiarity can be manifested in proximity sandwich where Tc+ becomes an inflection point for critical temperature being a function of superconducting layer thickness.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2017. Vol. 381, no 37, 3241-3245 p.
Keyword [en]
Multiband superconductivity, Superconducting correlations, Proximity, Ginzburg-Landau equation
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-215435DOI: 10.1016/j.physleta.2017.08.010ISI: 000411543400016Scopus ID: 2-s2.0-85027455309OAI: oai:DiVA.org:kth-215435DiVA: diva2:1150747
Note

QC 20171019

Available from: 2017-10-19 Created: 2017-10-19 Last updated: 2017-10-19Bibliographically approved

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