Influence of disorder on superconducting correlations in nanoparticles
Faculty of Sciences. Physics
New York, N.Y.
Journal of superconductivity and novel magnetism. - New York, N.Y.
, p. 605-609
University of Antwerp
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.