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Phonon limited superconducting correlations in metallic nanograins

Title data

Croitoru, Mikhail D. ; Shanenko, A. A. ; Vagov, Alexei ; Milošević, M. V. ; Axt, Vollrath M. ; Peeters, F. M.:
Phonon limited superconducting correlations in metallic nanograins.
In: Scientific Reports. Vol. 5 (2015) . - Art.Nr. 16515, 9 S..
ISSN 2045-2322
DOI: https://doi.org/10.1038/srep16515

Project information

Project financing: Supported by the Belgian Science Policy (BELSPO Back to Belgium Grant), the Research Foundation Flanders (FWO), the Methusalem Foundation of the Flemish Government, TOPBOF-UA, and the bilateral project CNPq-FWO.

Abstract in another language

Conventional superconductivity is inevitably suppressed in ultra-small metallic grains for characteristic sizes smaller than the Anderson limit. Experiments have shown that above the Anderson limit the critical temperature may be either enhanced or reduced when decreasing the particle size, depending on the superconducting material. In addition, there is experimental evidence that whether an enhancement or a reduction is found depends on the strength of the electron-phonon interaction in the bulk. We reveal how the strength of the e-ph interaction interplays with the quantum-size effect and theoretically obtain the critical temperature of the superconducting nanograins in excellent agreement with experimental data. We demonstrate that strong e-ph scattering smears the peak structure in the electronic density-of-states of a metallic grain and enhances the electron mass, and thereby limits the highest Tc achievable by quantum confinement.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: superconductivity; confined systems; metallic grains; BCS; electron-phonon interaction; Anderson limit
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III > Chair Theoretical Physics III - Univ.-Prof. Dr. Martin Axt
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
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: 02 Nov 2017 12:54
Last Modified: 02 Nov 2017 12:54
URI: https://eref.uni-bayreuth.de/id/eprint/40282