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

• Published in: Physica. C, Superconductivity Superconductivity, 1995-01, Vol.241 (3), p.389-396
• Main Authors: Shinozaki, B., Fujiki, H., Kawaguti, T., Fujimori, Y., Ichikawa, F., Fukami, T., Aomine, T.
• Format: Article
• Language: English
• Subjects: Applied sciences; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.); Low tc films; Metals. Metallurgy; Physics; Properties of type I and type II superconductors; Superconducting films and low-dimensional structures; Superconductivity; Transport properties (electric and thermal conductivity, thermoelectric effects, etc.)
• ISSN: 0921-4534; 1873-2143
• DOI: 10.1016/0921-4534(94)02396-4

The excess conductance σ′ and the magnetoconductance Δσ in a field H due to superconducting fluctuations have been measured at temperatures near T c 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 Δσ MT 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 Δσ MT 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.