Abstract
We study the problem of superconductivity in the canonicalensemble which applies to recent experiments on metallicnanoparticles. Spectral properties which can be expressed asuniversal functions allow a quantitative characterization ofthe crossover to “superconductivity” in finite metallicsystems. Parity effects in the ground state and excitationspectrum are discussed. We discuss the thermodynamicquantities as well. The susceptibility for odd grains shows areentrant behavior with temperature. This behavior may be anobservable signature of superconducting correlations inultrasmall grains.
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Falci, G., Fazio, R., Hekking, F.W.J. et al. Thermodynamic and spectral properties of ultrasmall superconducting grains. Journal of Low Temperature Physics 118, 355–364 (2000). https://doi.org/10.1023/A:1004689916830
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DOI: https://doi.org/10.1023/A:1004689916830