Superconducting Fluctuation Conductivity in Deposited Layer of Pb Fine Particles

Abstract

The excess conductivity Δσ above the superconducting transition temperature was measured for the deposited layer of Pb fine particles prepared by the gas evaporation method. For the layer with larger particle size than the coherence length ξ(0) for pure lead, the temperature dependence of Δσ agrees with that of the fluctuation conductivity Δσ_3D for 3 dimensional system of the Aslamazov-Larkin theory, but for the layer with smaller particle size than ξ(0), Δσ deviates from Δσ_3D. It is considered that the deviation is due to the fluctuations arising across the many fine particles in the layer.