Analysis of the superconducting-fluctuation conductance due to the Maki-Thompson contribution in aluminum films

The excess conductance σ′ and the magnetoconductance Δσ in a field H due to superconducting fluctuations have been measured at temperatures near Tc for Al films in the wide range of the sheet resistance R □ , 5.8 Ω/□ ⪅- R □ ⪅- 160 Ω/□ . The contributions due to the Maki-Thompson (MT) correction σ′MT and ΔσMT are well described by the recent Reizer theory, which was obtained from reconsidering the theory of Keller and Korenman. As predicted by the recent theory, the dirtiness dependence of σ′MT and ΔσMT of weak-coupling superconducting films is explained by only R□ without any adjustable parameter. The T dependence of σ′ and the T and H dependence of Δσ for all films are satisfactorily explained by theories including the Aslamazov-Larkin contributions, using R□ as the fitting parameter within a factor of 0.7–1.3 of experimentally determined values.