Fluctuation Conductance and Magnetoconductance in Superconducting Aluminum Films

概要

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The excess conductance σ' and the magnetoconductanceΔσ due to superconducting fluctuations have been measured at temperatures near superconducting transition temperature T_c of aluminum films. The data are analysed in terms of a current theory of the Maki-Thompson (MT) correction of which final expressions for σ'_<MT> and Δσ_<MT> depend on the electron mean free path l but not on the electron phase-relaxation time. Experimental results agree well with the sum of the AL (Aslamazov-Larkin) term and the present MT term. The value of l obtained by a best fit to the data on Δσ is reasonable. However, it increases with increasing temperature.
社団法人日本物理学会の論文
1993-12-15