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Influence of Disorder on Superconducting Correlations in Nanoparticles

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Abstract

We investigate how the interplay of quantum confinement and level broadening caused by disorder affects superconducting correlations in ultra-small metallic grains. We use the electron-phonon interaction-induced electron mass renormalization and the reduced static-path approximation of the BCS formalism to calculate the critical temperature as a function of the grain size. We show how the strong electron-impurity scattering additionally smears the peak structure in the electronic density of states of a metallic grain and imposes additional limits on the critical temperature under strong quantum confinement.

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Acknowledgments

This work was supported by the Belgian Science Policy (BELSPO Back to Belgium Grant), the Flemish Science Foundation (FWO-Vl), the Methusalem Foundation of the Flemish Government, TOPBOF-UA, and the bilateral project CNPq-FWO-Vl.

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Authors and Affiliations

  1. Departement Fysica, Universiteit Antwerpen, B-2020, Antwerpen, Belgium

    M. D. Croitoru, M. V. Milošević & F. M. Peeters

  2. Universidade Federal de Pernambuco, 50670-901 Recife, Pernambuco, Brazil

    M. D. Croitoru & A. A. Shanenko

  3. Theoretische Physik III, Universität Bayreuth, 95440, Bayreuth, Germany

    A. Vagov & V. M. Axt

  4. National Research University Higher School of Economics, 101000, Moscow, Russian Federation

    A. S. Vasenko

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  1. M. D. Croitoru
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Correspondence to M. D. Croitoru.

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Croitoru, M.D., Shanenko, A.A., Vagov, A. et al. Influence of Disorder on Superconducting Correlations in Nanoparticles. J Supercond Nov Magn 29, 605–609 (2016). https://doi.org/10.1007/s10948-015-3319-8

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  • DOI: https://doi.org/10.1007/s10948-015-3319-8

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