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Multiband superconductors with degenerate excitation gaps

Title data

Cavalcanti, Paulo J. F. ; Saraiva, Tiago T. ; Aguiar, J. Albino ; Vagov, Alexei ; Croitoru, M. D. ; Shanenko, A. A.:
Multiband superconductors with degenerate excitation gaps.
In: Journal of Physics: Condensed Matter. Vol. 32 (October 2020) Issue 45 . - Art.Nr. 455702.
ISSN 1361-648X
DOI: https://doi.org/10.1088/1361-648X/aba776

Abstract in another language

There is a tacit assumption that multiband superconductors are essentially the same as multigap superconductors. More precisely, it is usually assumed that the number of excitation gaps in the single-particle energy spectrum of a uniform superconductor (i.e. number of peaks in the density of states of the superconducting electrons) determines the number of contributing bands in the corresponding superconducting model. Here we demonstrate that contrary to this widely accepted viewpoint, the superconducting magnetic properties are sensitive to the number of contributing bands even when the spectral gaps are degenerate and cannot be distinguished. In particular, we find that the crossover between superconductivity types I and II—the intertype regime—is strongly affected by the difference between characteristic lengths of multiple contributing condensates. The reason for this is that condensates with diverse characteristic lengths, when coexisting in one system, interfere constructively or destructively, which results in multi-condensate magnetic phenomena regardless of the presence/absence of the multigap spectrum of a superconducting multiband material.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 15 Feb 2021 13:12
Last Modified: 15 Feb 2021 13:12
URI: https://eref.uni-bayreuth.de/id/eprint/63071